Question 1083254
If you withdrew 1/10th of your account, then you should have 9/10ths of it left. So $80 represents 9/10th of what you originally had. Let your original balance be x. Then:
(9/10)x=80
.9x=80
x=80/.9
x=$88.89 as your original balance. ☺☺☺☺