Question
Because of a 10% rise in mobile data prices, Ayesha decided
to use 15% less data. Find out the percentage change in her data expenses.Solution
ATQ,
Let initial data price be Rs. 100a and data usage be 100b GB
Initial expenditure = 100a × 100b = Rs. 10000ab
New expenditure = (1.10 × 100a) × (0.85 × 100b) = Rs. 9350ab
Required percent = [(9350ab - 10000ab) ÷ 10000ab] × 100 = -6.5% decrease
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