If the S.P of Rs.40 results in a 20% discount on the list price. What S.P would result in a 30% discount on list price?

A Rs 18

B Rs 20

C Rs 35

D Rs 27

Correct Answer: Option C

Let the list price be Rs. x
80/100x = 40
=> x = 40 x 100/80 = 50
∴ Required S.P. = 70% of Rs. 50=Rs.35