A shopkeeper sold a book for $ 180.He made a profit of 20%.calculate the cost price of the book. Please help!Am new to this chapter.

Hello!

The cost of the book is $150.

CP =

Basically, what this formula is saying is that to find the cost price (CP), we must multiply the sale price (SP) by 100, and divide the product by the sum of 100 + profit percentage (PP).

CP =

CP =

CP = 150

$150

Step-by-step explanation:

let cp=x

(20/100*x) +x=180

1/5x+x=180

6x/5=180

6x=180*5

x=(180*5)/6

x=150