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51
If a person purchases a shirt, he gets 6% discount. However, if he purchases two shirts, he gets 5% on the first and 8% on the second. If the price paid by the person for two shirts is Rs. 925, then what will be the marked price of each shirts ?
Discuss
Answer & Solution
Answer: Option A
Solution:
Let marked price = 100x, then by statement
95x + 92x → selling price of both
$$\eqalign{ & \Rightarrow 187x \to 925 \cr & \Rightarrow x \to \frac{{925}}{{187}} = 4.94 \cr & {\text{Marked price }} \cr & {\text{ = 4}}{\text{.94}} \times {\text{100 }} \cr & {\text{ = Rs}}{\text{. 494}} \cr} $$
52
The selling price of an article is Rs. 1920 and the discount given is 4%. The marked price of the article is = ?
Discuss
Answer & Solution
Answer: Option B
Solution:
Let marked price = Rs. x
Selling price after 4% discount $${\text{ = Rs}}{\text{.}}\frac{{96x}}{{100}}$$
$$\eqalign{ & \therefore \frac{{96x}}{{100}} = 1920 \cr & \Rightarrow x = \frac{{1920 \times 100}}{{96}} \cr & \Rightarrow x = {\text{Rs. 2000}} \cr} $$
53
If an electricity bill is paid before due date, one gets a reduction of 4% on the amount of the bill. By paying the bill before due date a person got a reduction of Rs. 13. The amount of his electricity bill was = ?
Discuss
Answer & Solution
Answer: Option C
Solution:
Let the amount of bill = Rs. x
According to the question,
$$\eqalign{ & \Rightarrow \frac{{4x}}{{100}} = 13 \cr & x = \frac{{13 \times 100}}{4} \cr & x = {\text{Rs}}{\text{. 325}} \cr} $$

Alternate :
Let the amount of bill = 100 units
4% of 100 units = 4 units
$$\eqalign{ & \therefore \,{\text{ 4 units}} = {\text{ 13}} \cr & \Rightarrow \,{\text{1 unit}} = \frac{{13}}{4} \cr & \Rightarrow 100\,{\text{units = }}\frac{{13}}{4} \times 100 \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = {\text{Rs}}{\text{. 325}} \cr} $$
54
The single discount equal to three consecutive discounts of 10%, 12% and 5% ?
Discuss
Answer & Solution
Answer: Option C
Solution:
Let the marked price Rs. 100
$$\eqalign{ & {\text{Final selling price}} \cr & {\text{ = 100}} \times \frac{{90}}{{100}} \times \frac{{88}}{{100}} \times \frac{{95}}{{100}} \cr & {\text{ = Rs}}{\text{. 75}}{\text{.24 }} \cr & {\text{Net discount }} \cr & {\text{ = }}\left( {100 - 75.24} \right) \cr & {\text{ = 24}}{\text{.76}}\% \cr} $$

Alternate :
Single equivalent discount for 10% and 12%
$$\eqalign{ & = \left( {10 + 12 - \frac{{10 \times 12}}{{100}}} \right)\% \cr & = 20.8\% \cr} $$
Single equivalent discount for 20.8% and 5%
$$\eqalign{ & = \left( {20.8 + 5 - \frac{{20.8 \times 5}}{{100}}} \right)\% \cr & = 24.76\% \cr} $$
55
The difference between discount of 35% and two successive discount of 20% on a certain bill was 22, the amount of the bill is = ?
Discuss
Answer & Solution
Answer: Option D
Solution:
1st discount = 35%
Single equivalent discount of 20% each
$$\eqalign{ & = \left( {20 + 20 - \frac{{20 \times 20}}{{100}}} \right)\% \cr & = {\text{ }}36\% {\text{ }} \cr & {\text{Difference}} \cr & = \left( {36\% - 35\% } \right) \cr & = 1\% \cr} $$
Let the amount of the bill Rs. x
$$\eqalign{ & \therefore \frac{1}{{100}}x = 22 \cr & x = {\text{Rs}}{\text{. }}2200 \cr} $$
56
A owes B, Rs. 1573 payable $${\text{1}}\frac{{\text{1}}}{{\text{2}}}$$ years hence. Also B owes A, Rs. 1444.50 payable 6 months hence. If they want to settle the account forthwith, keeping 14% as the rate of interest, then who should pay and how much ?
Discuss
Answer & Solution
Answer: Option D
Solution:
A owes = P.W. of Rs. 1573 due $$\frac{3}{2}$$ years hence
$$\eqalign{ & = {\text{Rs}}{\text{.}}\,\left[ {\frac{{1573 \times 100}}{{100 + \left( {14 \times \frac{3}{2}} \right)}}} \right]\, \cr & = {\text{Rs}}{\text{.}}\,\left( {\frac{{1573 \times 100}}{{121}}} \right) \cr & = {\text{Rs}}{\text{.}}\,1300. \cr} $$
B owes = P.W. of Rs. 1444.50 due 6 months hence
$$\eqalign{ & = {\text{Rs}}{\text{.}}\,\left[ {\frac{{1444.50 \times 100}}{{100 + \left( {14 \times \frac{1}{2}} \right)}}} \right]\, \cr & = \,{\text{Rs}}{\text{.}}\,\left( {\frac{{1444.50 \times 100}}{{107}}} \right) \cr & = {\text{Rs}}{\text{.}}\,1350. \cr & \therefore \,{\text{B}}\,{\text{must}}\,{\text{pay}}\,{\text{Rs}}{\text{.}}\,\,{\text{50}}\,{\text{to}}\,{\text{A}} \cr} $$
57
The marked price of the a watch is Rs. 1600. The shopkeeper gives successive discount of 10% and x% to the customer. It the customer pays Rs. 1224 for the watch, the value of x is = ?
Discuss
Answer & Solution
Answer: Option C
Solution:
Marked price of watch = Rs. 1600
After 1st discount of 10%
$$\eqalign{ & {\text{ = 1600}} \times \frac{{90}}{{100}} \cr & {\text{ = Rs}}{\text{. 1440}} \cr} $$
Customer pays (final selling price) = Rs. 1224
$$\eqalign{ & \frac{x}{{100}} \times 1440 = \left( {1440 - 1224} \right) \cr & \frac{x}{{100}} \times 1440 = 216 \cr & x = \frac{{216 \times 100}}{{1440}} \cr & x = 15\% \cr} $$
58
A single discount equivalent to discount series 20% , 20% and 10% is = ?
Discuss
Answer & Solution
Answer: Option C
Solution:
Single equivalent discount for 20% and 20%
$$\eqalign{ & = 20 + 20 - \frac{{20 \times 20}}{{100}} \cr & = 40 - 4 \cr & = 36\% \cr} $$
Single equivalent discount for 36% and 10%
$$\eqalign{ & = 36 + 10 - \frac{{36 \times 10}}{{100}} \cr & = 46 - 3.6 \cr & = 42.4\% \cr} $$
59
The single discount equivalent to the discount series of 20%, 10% and 5% is = ?
Discuss
Answer & Solution
Answer: Option B
Solution:
Single equivalent discount for 20% and 10%
$$\eqalign{ & = 20 + 10 - \frac{{20 \times 10}}{{100}} \cr & = 30 - 2 \cr & = 28\% \cr} $$
Single equivalent discount for 28% and 5%
$$\eqalign{ & = 28 + 5 - \frac{{28 \times 5}}{{100}} \cr & = 33 - 1.4 \cr & = 31.6\% \cr} $$
60
Successive discount of p% and q% on the catalogue price of an article is equivalent to a single discount of = ?
Discuss
Answer & Solution
Answer: Option C
Solution:
$$ = \left( {p - q + \frac{{pq}}{{100}}} \right)\% $$