[email protected] wrote:Question: "The cost price of a doll is Rs.250 and Marked price is Rs.300. What is the discount to be given to get the 20% profit?"

Solution: Let S.P=x

Profit%= (S.P - C.P)* 100 / C.P
20 = (x-250)* 100 / 250
20*250/100 = x-250
50 = x-250
50+250 = x
Hence S.P = Rs.300 & M.P = Rs.300
Hence discount = M.P-S.P = 300-300 = 0
Hence zero % discount is to be given to get 20% profit

Do you have any query with the problem and the solution.
Between, please post the question with all available options and hide the actual solution and OA

SP = CP * (1+profit/100)
= 250 *(1 + 20/100)
= 250 * 1.2
= 300

Discount= (MP-SP)*100/MP
= 0

[email protected] wrote:Question: "The cost price of a doll is Rs.250 and Marked price is Rs.300. What is the discount to be given to get the 20% profit?"

Proceeding with a further shortcut method to solve the problem mentally within 30 seconds...


20% => 1/5.

Given - to get the 20% profit <=> Profit = 1/5 th of Cost Price ( Coz profit is always calculated on the Cost Price )

Now , Profit is 50.

Selling price is 300 (250 + 50 = CP + P )

Marked Price is 300

So the shopkeeper doesn't allow any discount and sells the article at the marked price - Hence profit % is 0%...

[email protected] Whatever solution you posted is perfectly correct...

profit or loss % is always calculated on the cost price and not something else.

Also, whenever you post a query at BTG, please do it with options and as if the question is presented in the actual GMAT.

Hope this post was useful to you, thanx.