The price of sugar per kg increased from Rs. 16 to Rs. 20. The percentage reduction in the use of sugar so that the expenditure does not increase, should be :

Answer: Option B

Let original consumption = 100 kg and new consumption = $$x$$ kg
So,
⇔ 100 × 16 = $$x$$ × 20
⇔ $$x$$ = 80
∴ Reduction in consumption = 20%