A shopkeeper buys some pens. If he sells them @ Rs. 13 per pen, his total loss is Rs. 150 but on selling them @ Rs. 15 per pen, his total gain is Rs. 100. How many pens did he sell?
A. 100
B. 125
C. 150
D. 250
A. 100
B. 125
C. 150
D. 250
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