# What will be the C.P of Blackboard? If

A trader marks his goods 20% above C.P but allows his customers a discount of 10%. The C.P of a blackboard, which is sold for Rs. 216 is:

- Rs.200
- Rs.180
- Rs.108
- Rs.196

**Answer: (1) Rs.200
Explanation:-**

Let be the C.P. of a black board = Rs.100

He marks 20% above C.P.

Then, the C.P. = 100 + 100 x 20/100 = 100 + 20 = Rs.120

He gave 10% discount

Then, the selling price = 120 – 120 x 10/100 = 120 – 12 = Rs.108

the C.P of black board = 216 x 100/108 = Rs.200

Hence, the C. P. of a black board is Rs.200. **Ans.**