selling price of a toy car is Rs540.If the profit made by shopkeeper is 20%,what is the CP of the toy.

Ans int the textbook: CP+20/100 XCP = { 1 +1/5} CP. =6/5CP. 540 x 5/6 CP. 0r 450Rs.

This eg is done in the textbook.page169.Iam not getting how they got this 1.

$$\begin{gathered} Dear student, \\ Q. \cos t price of a toy car is Rs 540. if the loss made by the shop keeper is 20\% , what is the selling price of this toy? \\ Sol. Cost price\left(CP\right)=Rs 540 \\ Loss incurred =20\% on CP \\ =\frac{20}{100}\times 540 \\ =Rs 108 \\ Selling Price \left(SP\right) = CP-Loss \\ =Rs\left(540-108\right) \\ =Rs 432 \\ Regards \end{gathered}$$