The price of sugar is increased by 20%. By how much % the consumption of sugar is reduced so as not to increase the expenditure?
Explanation:
Let C be the % change in consumption.
Net % change in expenditure = 0 = 20 + C + (20 × C)/100
⇒ -20 = C + C/5
⇒ -20 = 6C/5
⇒ C = -100/6% or 16.67% reduction.
Hence, option (a).
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