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

Correct Answer: 400,000

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
Bissoy MCQ
#গণিত #লাভ-ক্ষতি (Profit and loss) #Bangladesh House Building Finance Corporation (BHBFC) #Bangladesh House Building Finance Corporation - Senior Officer - 29.07.2011

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