The price of sugaris increased by 20%. By what percentage must one cut down on the consumption of sugar, so that no extra amount has to be incurred on sugar?
Percentage decrements in the consumption of sugar = $$\frac{rate}{100 + rate} \times 100$$
= $$\frac{20}{100 + 20} \times 100$$ = $$\frac{20}{120} \times 100$$ = $$16 \frac{2}{3}$$%
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