Question

A calculator is sold for Rs 345 at a profit of 15%. Find the cost price of the calculator. At what price must it be sold to earn a profit of 25%?​

Answer 1

As it is given that Selling price of calculator is $Rs345$

Also $15\%$ profit means if $C.P$ is $Rs100$, profit is $Rs15$

therefore $SP=100+15=Rs115$

now when $\mathrm{SP}\mathrm{is}\mathrm{Rs}345$

$CP=\frac{100}{115}\times 345=Rs300$

Therefore $CP=Rs300$

$nowprofit=\frac{profitpercent}{C.P}\times 100$

$=\frac{25}{300}\times 100$

$=Rs8.3$

$SP=C.P+profit$

$$\begin{gathered} =300+8.3 \\ i.eSP=RS308.3 \end{gathered}$$

Hence S.P must be $Rs308.3$