81
10% off = 90% left = 86.46*90/100 = 77.814
10% off of 90 dollars = 90% of 90 dollars = 90 dollars * 90/100 = 81 dollars.
10% off of $90 leaves $81.
10% off of 240 = 90% of 240 = 240*90/100 = 216
10% off of 1250 = 90% of 1250 = 1250*90/100 = 1125
10% off of 278 = 90% [left] of 278 = 278*90/100 = 250.2
10% off 29.52 = 90% of 29.52 = 29.52*90/100 = 26.568
10% off of 1520.00 = 90% left of 1520.00 = 1520.00*90/100 = 1368.00
10% off 2 = 90% left = 2*90/100 = 1.8
90% off of 52 = 10% left of 52 = 52*10/100 = 5.2
10% off of 1599 = 90% left of 1599 = 1599*90/100 = 1439.1.
10% off of 42.99 = 90% left of 42.99 = 42.99*90/100 = 38.691