question_answer 7)

Find (a) 15% of 250                    (b) 1% of 1 hour                (c) 20% of ` 2500              (d) 75% of 1kg.                

Answer:

                (a) 15% of \[250=\frac{15}{100}\times 250=\frac{75}{2}=37.5\]                 (b) 1% of 1 hour \[\text{= }\frac{\text{1}}{\text{100}}\text{  }\!\!\times\!\!\text{  1 hour}\] \[\text{ = }\frac{\text{1}}{\text{100}}\text{ hour = }\frac{\text{3}}{\text{5}}\] minute or 36 sec. (c) 20% of  ` 2500 = `\[\frac{20}{100}\times 2500=\]` 500 (d) 75% of \[\text{1 kg =}\frac{\text{75}}{\text{100}}\text{  }\!\!\times\!\!\text{  1 kg = }\frac{\text{3}}{\text{4}}\text{kg = 750g}\]