Let the marked price be **x**.

Discount percent = Discount / Marked price x 100

20 = Discount/**x** x100

Discount = 20/100 x **x** = 1/5x

Also,

Discount = Marked price − Sale price

1/5**x** = **x** - Rs 1600

**x** - (1/5)**x** = Rs 1600

(4/5)**x** = Rs 1600

*x* = Rs ( 1600 x 5/4 ) = Rs 2000

Thus, the marked price was Rs 2000.