If the price of sugar rises from Rs. 6 per kg to Rs. 7.50 per kg, a person, to have no increase in the expenditure on sugar, will have to reduce his consumption of sugar by  Choose the correct choice
A) 15%  B) 20%  C) 25%  D) 30%  E) none
Sol.   Let the original consumption = 100 kg and new consumption = x kg.   So, 100 x 6 = x × 7.50 = x = 80 kg.   ∴ Reduction in consumption = 20%.   Answer 20%
<result>B</result>
If the price of sugar rises from Rs. 6 per kg to Rs. 7.50 per kg, a person, to have no increase in the expenditure on sugar, will have to reduce his consumption of sugar by