Question
Monthly savings of 'C' was 50% of her income. Later, her
monthly income increased by 40% but her savings stayed the same. What is the percentage increase or decrease in her monthly expenditure?Solution
ATQ, Let the monthly income of 'C' be Rs. 100x. Monthly savings of 'C' = 0.50 × 100x = Rs. 50x Initial monthly expenditure of 'C' = 100x – 50x = Rs. 50x Increased monthly income = 1.40 × 100x = Rs. 140x New monthly expenditure = 140x – 50x = Rs. 90x Percentage increase in expenditure = [(90x – 50x) / 50x] × 100 = 80%
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