Question

if the selling price of 10 pens is equal to the cost of 15 pens find gain percent​

Answer 1

Answer:

We have been given the selling price of 10 pens is equal to the cost of 14 pens

We need to find the gain percent.

Let the S.P of 1 pen be x and the C.P of 1 pen be y.

From the given info we get that

\begin{gathered}\begin{aligned}&10 x=14 y\\\\&x=\frac{14 y}{10}\\\\&x=\frac{7}{5} y\end{aligned}\end{gathered}

10x=14y

x=

10

14y

x=

5

7

y