Question

the profit obtained by selling 12 is equal to selling price of 2 articles, what is profit %​

Answer 1

Let S.P. of 1 article = Rs. 1.

Then, C.P. of 12 articles = S.P.of 10 articles = Rs. 10

S.P. of 12 articles = Rs. 12

∴ Profit = Rs. 12 − Rs. 10= Rs. 2

⇒Profit %= (10/2×100) %=20%

Answer 2

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S.P.of 12 note book-C.P.of 12 note book=S.P. of 4 note book

C.P.of 12 note book=S.P.of 8 note book

Let C.P.of each note book=1 Rs.

Then C.P of 8 note book=8 Rs.

S.P. of 8 note book=12 Rs.

∴Profit=12−8=4

Profit %=84×100=50