We know that the VAT = 10%
SP = ₹1980
So let’s consider the original price of watch as x
∴ VAT amount = 10% of x
= x/10
∴ x + x/10 = 1980
(10x + x)/10 = 1980
11x /10 = 1980
x = (1980 × 10) / 11
x = 1800
∴ The original price of the watch excluding VAT is ₹1800