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a merchant sells an item

Expert replies
by buoyant » Sat Dec 20, 2014 7:25 pm
A merchant sells an item at a 20 percent discount but still makes a gross profit of 20 percent of the cost. What percent of the cost would the gross profit on the item have been if the item had been sold without the discount?

a)20%
b)40%
c)50%
d)60%
e)75%

[spoiler]OA:C[/spoiler]
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Source: — Problem Solving |

by [email protected] » Sat Dec 20, 2014 7:55 pm
Hi buoyant,

This question is perfect for TESTing VALUES, but you have to be very careful about how you do the math.

Let's break this into pieces...

A merchant sells an item at a discount and makes a gross profit of 20% on the cost.

Let's TEST VALUES:
Cost = $100
Discount Price = $120
Here we have a 20% profit on the cost...

Regular Price = $X

Now, let's factor in the fact that the sale price was a 20% discount...

$120 = X - (.2)(X)
$120 = .8X
$1200 = 8X
$150 = X

So, the regular price was $150.

We're asked what the profit would have been WITHOUT the discount:
Cost: $100
Regular Price = $150

Profit = (150 - 100)/100 = 50/100 = 50%

Final Answer: C

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by GMATGuruNY » Sat Dec 20, 2014 8:31 pm
buoyant wrote:A merchant sells an item at a 20 percent discount but still makes a gross profit of 20 percent of the cost. What percent of the cost would the gross profit on the item have been if the item had been sold without the discount?

a)20%
b)40%
c)50%
d)60%
e)75%
Let the cost = $100.
We can PLUG IN THE ANSWERS, which represent the profit without the discount.
When the correct answer choice is plugged in, the discounted selling price will yield a 20% profit, implying a discounted selling price of $120.

Answer choice D: 60% profit without the discount
60% of 100 = $60, implying a regular selling price of $160.
Selling price with a 20% discount = 160 - 20% of 160 = 160-32 = 128.
The discounted price is too great.
Eliminate D.

Answer choice B: 40% profit without the discount
40% of 100 = $40, implying a regular selling price of $140.
Selling price with a 20% discount = 140 - 20% of 140 = 140-28 = 112.
The discounted price is too small.
Eliminate B.

Since D yields a discounted price that is too great, while B yields a discounted price that is too small, the correct answer choice must be between D and B.

The correct answer is C.

Answer choice C: 50% profit without the discount
50% of 100 = $50, implying a regular selling price of $150.
Selling price with a 20% discount = 150 - 20% of 150 = 150-30 = 120.
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by tass@ » Sun Dec 21, 2014 9:47 pm
Very Simple...........
Let after discount Profit+Cost = 120
So the mark price will be
120/80 * 100 =150
It means 50% profit will be if there is no discount
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by Matt@VeritasPrep » Mon Dec 22, 2014 12:01 pm
Wouldn't hurt to learn the algebra here either, so let's add that approach.

There are three prices to consider: the full price, the discounted price, and the merchant's cost.

Let's say the cost is x.

We know the discounted price is 20% GREATER than the cost, so that's x + (20% of x), or 1.2x.

We know the discounted price is 20% LESS than the full price. That means 1.2x = (80% of full price), or 1.2x = .8f, or 12x = 8f, or f = 1.5x. So the full price is 1.5x.

Since the cost is x, and the full price is 1.5x, the profit would be .5x, or 50% of x.
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