In my opinion the original amount is 80. First put the original amount as A1 and new amount as A2 then the change is 36 and 45% change. so A1 - A2 = 36.
36 = 45%
so
36 = 45%
x = 100%
then criss ceoss method.
x = 80. so A1 ia 80 and A2 is A1 - 36 = 44.
A1 ia 80 and A2 is 44 which A2 is the new the new amount.
