At the beginning of the year last year a math department budget was 15% of the total budget. This year it was 10% of the total budget. What percet did the math department budget decrease from last year?

Answer 1

(10%/15%)*100%=(10/15)*100%=
66.67%.

66.67% - 100%=-33.33% or 33.33% Decrease

Answer 2

Another Approach:

%Decrease = ((15%-10%)/15%)*100% =
(5/15)*100% = 33.33%