SOLUTION: The price of cooking oil went up by 15%. The percentage of reduction that a family should effect in the use of cooking oil so as not to increase the expenditure on this account is

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Question 1089172: The price of cooking oil went up by 15%. The percentage of reduction that a family should effect in the use of cooking oil so as not to increase the expenditure on this account is ?
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
Normally usage is some Q units of cooking oil.

Increased cost 1.15cross%28Q%29
Cost wanted, 1.00%2Across%28Q%29

x, fraction of 1.00Q cost
1.15Qx=1.00Q
1.15x=1
x=1%2F1.15

x=0.870
Family should use 87% of the oil that they had used now that the price increased, to keep the expenditure the same.