So this can be solved as a ratio and the form I use for ratios is
Is. =%
Of. 100
What we're looking for is a precentage
152. = x
121.16. 100
Cross multiply
121.16x=15200
Divide both sides by 121.16
X=125.4539
About 125%
-100% of the original amount
So the percentage of increase is about 25%