Question

Ravi bought some premium pens at Rs. 30 per pen and some regular pens at Rs. 15 per pen. He mixed all of them and marked each pen at 60% above the average cost price of all the pens bought. He sold the entire lot at 25% discount and made a profit of Rs. 180. Find the maximum number of pens bought by Ravi if he bought at least one pen of each type.

A 72
B 78
C 80
D 82
E None of these
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