Question

Find:

(i) 25% of Rs 76
(ii) 20% of Rs 132
(iii) 7.5% of 600 m
(iv) $3\frac{1}{3}\%\mathrm{of}90\mathrm{km}$
(v) 8.5% of 5 kg
(vi) 20% of 12 litres

Answer 1

We have the following:

(i) 25% of Rs 76 = Rs $\left(76\times \frac{25}{100}\right)$ = Rs $\left(76\times \frac{1}{4}\right)$ = Rs 19

(ii) 20% of Rs 132 = Rs $\left(132\times \frac{20}{100}\right)$= Rs $\left(132\times \frac{1}{5}\right)$ = Rs 26.4

(iii) 7.5% of 600 m = $\left(600\times \frac{7.5}{100}\right)\mathrm{m}=\left(6\times 7.5\right)\mathrm{m}=45\mathrm{m}$

(iv) $3\frac{1}{3}\%$ of 90 km = $\frac{10}{3}\%$of 90 km =$\left(90\times \frac{10}{3\times 100}\right)\mathrm{km}=\left(90\times \frac{1}{30}\right)\mathrm{km}=3\mathrm{km}$

(v) 8.5% of 5 kg = $\left(5\times \frac{8.5}{100}\right)\mathrm{kg}=\left(5\times \frac{85}{1000}\right)\mathrm{kg}=0.425\mathrm{kg}=425\mathrm{g}$ [∵1 kg = 1000 g]

(vi) 20% of 12 L = $\left(12\times \frac{20}{100}\right)\mathrm{L}=\left(12\times \frac{1}{5}\right)\mathrm{L}=2.4\mathrm{L}$