In the new budget the price of milk rose by 10%. By how much percent must a person reduce his consumption so that his expenditure on it does not increase?  Choices
A) 7.5%  B) 9.1%  C) 10.9%  D) 12.6%  E) 15%
Reduce in consumption = R/(100+R) *100% = 10/110 *100 = 9.1%   Answer is 10.9%
<result>C</result>
In the new budget the price of milk rose by 10%. By how much percent must a person reduce his consumption so that his expenditure on it does not increase?