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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?
CP= LP(1-m%) =?
SP= LP(1-n%)

(1) m = 30
We don't know about List Price
Insufficient

(2) m - n = 10
We don't know about List Price and m
Insufficient

(1)&(2) together
We don't know List Price
Insufficient

Answer: E
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What we need to find out?
Quote:
What was the price for which the car dealer purchased the car?

What were the 2 options given to us?

Quote:
(1) m = 30
(2) m - n = 10

Both are related to the percentage; Regarding the "price" no information neither in the question nor in the options. So E is the right choice for sure.

Hope it helps.

Thank you,
Nikkz 99

It is okay to take smaller steps rather than not making any progress towards the goal.
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