Question

Plz help.

Four sisters bought a present for their father. they received a 10% discount on the original price of the gift. After the discount was taken, each sister paid $9.00. What was the original price of the gift? 
its multiple choice so the choices were between A.$40.00, B.$36.00, C.$16.00, & D.$32.73

Answer 1

`x-\ the price \ of \ the \ gift \ \\ \\ 10\% \ of \ x= (10)/(100)*x= (1)/(10)*x=(x)/(10)- the \ discount \\ \\x^((10) -(x)/(10)= (10x-x)/(10)= (9x)/(10) -the \ new \ price \ \\ \\4*9.00 \$=36 \$ -the \ price \ after \ discount \\ \\ (9x)/(10)=36 =>x=(10*36)/(9) \\ \\ \boxed{x=40 \$}`

the variant A.$40.00