70 percent off 140

70% off 140 is 42

140 minus 70 percent off is 42

The discount itself is 98: 140 × 70 ÷ 100 = 98. Taking it off 140 leaves 42.

Only approximately: 42 ÷ 0.3 = 140. The discount is rounded to the cent, so several prices give the same 42 — 139.99 (discount 97.99), 140 (discount 98) and 140.01 (discount 98.01); the paid price alone cannot tell them apart.