Given that C.P = 900
There is a gain of 10% on C.P
∴ Gain = 10% of ₹ 900
= \(\frac {10\times900}{100}\) = ₹ 90
∴ S.P = C.P. gain
= 900 + 90
S.P = ₹990 …………….. (1)
Let the marked price = ₹ x
Discount on it = 10% on M.P = \(\frac {10x}{100}\)
∴ Selling Price = MP – Discount
∴ M.P = x = ₹1100