Question
The ratio of the monthly expenditure to monthly income
is 4:5. If the salary increased by Rs. 4550 such that ratio of old saving and new saving is 2:3, if the expenditure remains same. Find the percentage increase in monthly income.Solution
Let the monthly expenditure and income be Rs. 4x and Rs. 5x Saving of the person = 5x-4x = Rs. x Increased in salary of Rs. 4550. Ratio of the saving is 2:3 Since the expenditure remains the same, an increase in salary contributes to savings. Difference in new saving to old saving = 1 unit 1 unit = Rs. 4550 2 unit = 2 x 4550 = Rs. 9100 = x Monthly income = Rs. 9100x5 = Rs. 45500 Percentage increase in salary = (4550/45500) x 100 = 10%
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