Word problem, have to show my work.

Question

4 sisters bought a gift, they received a 10% discount off original price. After discount each sister paid 9.00, what was original price of gift?

Answer 1

P = original price

 

10% discount mans they paid 90%.

 

P = 4($9.00/0.90) = $40

 

Another way to solve this:

 

4($9) = 0.90P

 

P = (4/0.90)($9) = $40

Answer 2

.90x = 4(9)

 

.90x = 36

 

x = 36/.90

 

x = 40