chetan2u wrote:
The proportion of annual expense on food in a household remains constant even after the annual expense on food increases by 20%. What would be the increase in Total annual expense?
(A) 0%
(B) 10%
(C) 20%
(D) 25%
(E) Cannot be determined
Let the proportion of expense on food to the total expense be x:y
The expense on food increases by 20%, making the expense on food 1.2x
Since this proportion has to remain constant, the total expense must become 1.2y(a 20% increase) (Option C)
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71% (01:22) correct 
