70 percent off 1300

70% off 1,300 is 390

1,300 minus 70 percent off is 390

The discount itself is 910: 1,300 × 70 ÷ 100 = 910. Taking it off 1,300 leaves 390.

Only approximately: 390 ÷ 0.3 = 1,300. The discount is rounded to the cent, so several prices give the same 390 — 1,299.99 (discount 909.99), 1,300 (discount 910) and 1,300.01 (discount 910.01); the paid price alone cannot tell them apart.