On selling a watch at 4/5 of the marked price, there is a loss of 10%. What will be the ratio of the marked price and the cost price of the watch?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 9 : 8.
SP = 0.9CP
Also, SP = (4/5)MP
So, (4/5)MP = 0.9CP
⇒ MP/CP = 0.9/(4/5) = 4.5/4 = 9/8
⇒ MP : CP = 9:8