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Solve this : (7.9% of 134) - (3.4% of 79) = ?
Answer & Solution
Correct Answer:
Option
E
(7.9% of 134) - (3.4% of 79)
$$ = \left( {\frac{{79}}{{10}} \times \frac{1}{{100}} \times 134} \right) - $$ $$\left( {\frac{{34}}{{10}} \times \frac{1}{{100}} \times 79} \right)$$
$$\eqalign{ & = \frac{{79}}{{1000}} \times \left( {134 - 34} \right) \cr & = \frac{{79}}{{1000}} \times 100 \cr & = \frac{{79}}{{10}} \cr & = 7.9 \cr} $$
$$ = \left( {\frac{{79}}{{10}} \times \frac{1}{{100}} \times 134} \right) - $$ $$\left( {\frac{{34}}{{10}} \times \frac{1}{{100}} \times 79} \right)$$
$$\eqalign{ & = \frac{{79}}{{1000}} \times \left( {134 - 34} \right) \cr & = \frac{{79}}{{1000}} \times 100 \cr & = \frac{{79}}{{10}} \cr & = 7.9 \cr} $$
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