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ATQ,
Initial price = Rs. 100m, consumption = n
Initial expenditure = 100mn
New price = 115m
New consumption = 100mn ÷ 115m = 100n ÷ 115
Decrease = n - (100n ÷ 115) = 15n ÷ 115
Required percent = (15n ÷ 115) ÷ n × 100 = 1500 ÷ 115 ≈ 13%
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