The price of a commodity rises from Rs. 6 per kg to Rs. 7.50 per kg. If the expenditure cannot increase, the percentage of reduction in consumption is
Price changes from 6 per kg to 7.5 per kg
let's say consumption changes from y to t.
So expenditure will be changed from 6y to 7.5t which is equal.
Hence 6y = 7.5t
or     t = $$\frac{4y}{5}$$
Percentage change in consumption =Â $$\frac{\frac{y}{5}}{y} \times 100$$
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