Question

Jamal bought a diamond ring at a 20% discount. He paid $2640 for the ring. Naomi bought a similar ring but was given a discount of $924. What was the percentage discount given to Naomi?

Answer 1

Answer: 72%

Explanation:

Set Jamal's original ring price = x

`x - x(0.2) = 2640\\x(1-0.2)=2640\\x(0.8)=2640\\x=(2640)/(0.8)=3300`

Jamal's original ring price = $3300

Set Naomi's discount = y

`3300-3300(y)=924\\=3300(1-y)=924\\1-y=(924)/(3300) \\-y=(924)/(3300) -1\\y=1-(924)/(3300)=1-0.28=0.72`

Naomi's discount is 0.72 = 72%