Correct option is D
Given:
Marked price = Rs. 18000
Discount = 40%
Profit = 10%
Formula Used:
CP/MP = (100 - Discount%) / (100 + Profit%)
Solution:
CP/MP = (100 - 40) / (100 + 10)
=> CP/MP = 60/110 = 6/11
=> CP/MP = 6/11
=> CP = (18000 × 6)/11 = Rs. 9818