Percentage - Aptitude MCQ Questions and Solutions with Explanations

Answer: Option B

Required percentage :
$$\eqalign{ & = \left( {\frac{{1987.50}}{{2650}} \times 100} \right)\% \cr & = \left( {\frac{{19875}}{{265}} \times \frac{1}{{100}} \times 100} \right)\% \cr & = 75\% \cr} $$

Answer: Option A

$$\eqalign{ & \Rightarrow 250{\left( {1 + \frac{R}{{100}}} \right)^3} = 2000 \cr & \Rightarrow {\left( {1 + \frac{R}{{100}}} \right)^3} = \frac{{2000}}{{250}} \cr & \Rightarrow {\left( {1 + \frac{R}{{100}}} \right)^3} = 8 = {\left( 2 \right)^3} \cr & \Rightarrow \left( {1 + \frac{R}{{100}}} \right) = 2 \cr & \Rightarrow \frac{R}{{100}} = 1 \cr & \Rightarrow R = 100 \% \cr} $$

Answer: Option E

(7.9% of 134) - (3.4% of 79)
$$ = \left( {\frac{{79}}{{10}} \times \frac{1}{{100}} \times 134} \right) - $$     $$\left( {\frac{{34}}{{10}} \times \frac{1}{{100}} \times 79} \right)$$
$$\eqalign{ & = \frac{{79}}{{1000}} \times \left( {134 - 34} \right) \cr & = \frac{{79}}{{1000}} \times 100 \cr & = \frac{{79}}{{10}} \cr & = 7.9 \cr} $$

Answer: Option D

Let 36% of 365 + x% of 56.2 = 156.69
Then,
$$ \Rightarrow \left( {\frac{{36}}{{100}} \times 365} \right) + \left( {\frac{x}{{100}} \times 56.2} \right)$$       $$ = 156.69$$
$$\eqalign{ & \Rightarrow \frac{{281}}{{500}}x = 156.69 - 131.4 \cr & \Rightarrow \frac{{281}}{{500}}x = 25.29 \cr & \Rightarrow x = \frac{{25.29 \times 500}}{{281}} \cr & \Rightarrow x = 45 \cr} $$

Answer: Option E

Let Reena's yearly income be Rs. x
Anubhab monthly income
= Rs. $$\frac{240000}{12}$$
= Rs. 20000
Then,
⇒ 25% of x = 75% of 20000
⇒ $$\frac{25}{100}$$x = $$\frac{75}{100}$$ × 20000
⇒ $$\frac{x}{4}$$ = 15000
⇒ x = 60000
∴ Reena's monthly income :
= Rs. $$\frac{60000}{12}$$
= Rs. 5000