When a book is sold for ₹ 10 there is a profit of ₹ 3. I

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When a book is sold for ₹ 10 there is a profit of ₹ 3. If the same book is sold for ₹ 20, what will be the profit ?

[DSSSB TGT 2014 (Science)]

A ₹ 6

B ₹ 13

C ₹ 7

D ₹ 17