Question

Let the CP of each orange be * 1.
22. By selling 8 dozen pencils, a shopkeeper gains the selling price of one dozen pencils. Find
his gain per cent.
Hint. (SP of 8 dozen pencils) – (CP of 8 dozen pencils) = SP of 1 dozen pencils
SP of 7 dozen pencils CP of 8 dozen pencils.
Let the CP of 1 dozen pencils be * 1.​

Answer 1

$\huge{ \orange{ \bold{ \underline{ \underline{Question: }}}}}$

By selling 8 dozen pencils, a shopkeeper gains the selling price of one dozen pencils. Find

$\huge{ \orange{ \bold{ \underline{ \underline{Answer:}}}}}$

We know that S.P. = C.P. + Gain

⇒ S.P. of 8 dozen = C.P. of 8 dozen + S.P. of 1 dozen

⇒ S.P. of 7 dozen = C.P. of 8 dozen

⇒ By selling 7 dozen, he gain 1 dozen

Therefore, gain % = 14 whole 2/7 %