A collection of books went on sale and 2/3 of these were sold for Tk. 2.30 each. None of the 36 remaining books were sold. What was the total amount received for the books that were sold?

A 180
B 135
C 90
D 60

Correct Answer: 180

Remaining books = 1 - 2/3 = 1/3 1/3 of the books = 36 So, 2/3 of the books = 36 x (2/3) / (1/3) = 72 Then, total amount received from the sold books = 72 x 2.3 = 165.6 TK. 
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