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The cost of a washing machine is 50% less than the cost of a TV. If the cost of the washing machine increases by 80% and that of the TV dec…

358752Medium DSSSB TGT Computer Science 0 replies 0 views

The cost of a washing machine is 50% less than the cost of a TV. If the cost of the washing machine increases by 80% and that of the TV decreases by 37%, then what is the percentage change in the total cost of 9 washing machines and 3 TVs?

AIncrease by 33.2%
BIncrease by 36%
CDecrease by 27%
DDecrease by 32%

Correct answer: A

Explanation

Let the TV cost 100, so the washing machine costs 50. Old total = 9 × 50 + 3 × 100 = 750. New costs: washing machine 90 and TV 63, so the new total = 9 × 90 + 3 × 63 = 999. Change = 249/750 = 33.2% increase.

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