Hi there!
First, we need to find the area of the rectangles.
10 × 5 = 50
9 × 3 = 27
Now, we find the percent of increase.
27 ÷ 50 = 0.54
Convert into a percentage:
0.54 = 54%
And subtract from 100%.
100% - 54% = 46%
The answer is 46%.
Hope this helps!