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Question:
An author received Taka 0.80 in royalties for each of the first 100,000 copies of his book sold, and Taka 0.60 in royalties for each additional copy sold. If he received a total of Taka 260,000 in royalties, how many copies of his book were sold?
a)
230,000
b)
350,000
c)
380,000
d)
400,000
e)
480,000
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Description:

Let the number of copies sold be X.

Then,  100000×0.8 + (X - 100000)×0.6 = 260000

or,  80000 + 0.6X - 60000 = 260000

or,  0.6X = 260000 - 80000 + 60000

or,  0.6X = 240000

or,  X = 240000/0.6 = 400000 copies

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