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  1. A shopkeeper sells his goods at 10% discount on the marked price. What price should he mark on an article that costs him ₹ 900 to gain 10% ?
    1. ₹ 1275
    2. ₹ 1250
    3. ₹ 1175
    4. ₹ 1100
Correct Option: D

Given that , C.P. of article = ₹ 900
Gain = 10%

∴  S.P. = ₹
110
× 900= ₹ 990
100

discount = 10%
Let the marked price be y.
∴ 
90
y = 990
100

∴ y =
990 × 100
= ₹ 1100
90

Second method to solve this question :
Here, D = 10%, C.P. = ₹ 900, R = 10%, M.P. = ?
Using the given formula ,
M.P.
=
100 + r
C.P.100 − D

M.P.
=
100 + 10
900100 − 10

M.P. =
110
× 900
90

M.P. = ₹ 1100


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