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jacob46
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Radhika1231
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GmatKnightTutor
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Hello, people. Let’s get into this. Fair to say this is a bit lengthy but not that tough from a conceptual point of view. You know what you have to do but being extra careful to keep track of what to calculate along the way and not making any careless errors can be helpful.

Looking at the percentages involved, let’s start with a friendly cost price which we can increase by 50% and then decrease by two-thirds without the values becoming hard to use.

Let’s start with a cost price of $10
The original sales price would therefore be $15
And the final sales price would be $5

Similarly, let’s use a friendly value for the number of hats involved: 100 hats

Remember, the final expression we’re looking to put all this into is: [(Total Revenue - Total Cost) / Total Cost] x 100

Total Revenue:

60% of hats were sold at the original sales price -> 60 hats @ $15 = $900

70% of the remaining 40% of hats were sold at the final sales price -> 28 hats @ $5 = $140

Total Revenue = $1040

Total Cost:

100 hats @ $10

Total Cost = $1000


___


We’re nearly there! All we have to do is plug these values into our final expression.

[(Total Revenue - Total Cost) / Total Cost] x 100

[($1040 - $1000) / $1000] x 100

4%

(B) is your answer.
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anushree01
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I reallt like the question & the solution provided. Thanks!
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