(12/10)*(8/10) = 96/100 of original area
96/100 is a 4% decrease from 100/100 ->
What is the % change in the area of a rectangle when its length increases by 20% and its width decreases by 20%?
A: 0%
B: 20% increase
C: 20% decrease
D: 4% decrease
E: Insufficient data