60 percent off 99

60% off 99 is 39.6

99 minus 60 percent off is 39.6

The discount itself is 59.4: 99 × 60 ÷ 100 = 59.4. Taking it off 99 leaves 39.6.

Only approximately: 39.6 ÷ 0.4 = 99. The discount is rounded to the cent, so several prices give the same 39.6 — 98.99 (discount 59.39), 99 (discount 59.4) and 99.01 (discount 59.41); the paid price alone cannot tell them apart.