Bunuel wrote:

A car dealer purchased a car for m percent less than its list price, and then sold the car for n percent less than its list price. What was the price for which the car dealer purchased the car?

(1) m = 30

(2) m - n = 10

Ans: E

Solution: question gives us info in terms of percent only and asks us to find the concrete value for the purchase price.

lets say if list price is p then

purchase price = p(1-m/100)

selling price = p(1-n/100)

1) if we put m = 30 in purchase price equation we still need value of p to find the absolute value of purchase price. [Not Sufficient]

2) this gives us relationship between m and n but nothing more. [Not Sufficient]\

together m=30 , n =20 but we still don't know the value of P [Not Sufficient]

Ans: E

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