Father reduced the quantity of food bought for the family...
Father reduced the quantity of food bought for the family by 10% when he found that the cost of living had increased 15%. Thus the fractional increase in the family food bill is now
112
635
19300
7200
5100
Correct answer is D
Let the cost of living = y.
The new cost of living = y+15y100=1.15y
The food bill now = (1−90100)(1.15y)
= 1.035y
The fractional increase in food bill = (1.035−1)×100
= 351000=7200
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