The cost price of an article is 70% of the marked price. Calculate the gain percent after allowing a discount of 10%. Select:
A) 13.6%  B) 28.6%  C) 35.6%  D) 42.3%  E) none
Sol.   Let marked price = Rs. 100. Then, C.P. = Rs. 70. S.P = Rs. 90.   âˆ´ Gain % = [20/70 * 100]% = 28.6%.   Answer 28.6%
<result>B</result>
The cost price of an article is 70% of the marked price. Calculate the gain percent after allowing a discount of 10%.