Question

​A fragrant soap was sold at $ 2.50 a sachet they cost $18 a dozen.what is gain or loss percentage on 3 dozen a sachet-

Answer 1

$$\begin{gathered} \mathrm{Cost}\mathrm{of}12\mathrm{sachets}=18\mathrm{dollars} \\ \mathrm{Cost}\mathrm{of}1\mathrm{sachet}=1.5\mathrm{dollar} \\ \mathrm{Selling}\mathrm{price}\mathrm{of}1\mathrm{sachet}=2.5\mathrm{dollar} \\ \mathrm{Now},\mathrm{profit}=\mathrm{selling}\mathrm{price}-\mathrm{cost}\mathrm{price}=2.2-1.5=1\mathrm{dollar} \\ \mathrm{Profit}\%=\left[\frac{\mathrm{profit}}{\mathrm{CP}}\times 100\right]\%=\left[\frac{1}{1.5}\times 100\right]\%=\left(\frac{200}{3}\right)=66\frac{2}{3}\% \end{gathered}$$