If a triangle got 4x as large what is the percent increase?
If a triangle got 12x as large what is the percent increase?
Assuming you mean 4 times as large:
a. 4/1 * 100% = 400%
% increase = 400-100 = 300.
b. 12/1 * 100% = 1200%
% increase = 1200-100 = 1100.