so assume that 215 is 100% and 372 is x%
it is an incease becase 215 is less than 372 so
215=100
372=x
so therefor
215/100=372/x
solve for x
multiply both sides by x/372
(43x)/7440=1
multiply both sides by 7440
43x=7440
divide both sides by 43
x=173.02
so it increased from 100 to 173.02 so find the change by subtracting 100 from 173.02
173.02-100=73.02
the change is 73.02%
