Question

What is the price of a $90 mobile phone after a 30% discount

Answer 1

Discount: $27.00

Final Price: $63.00

Explanation:

Discount = Original Price x Discount %/100

Discount = 90 × 30/100

Discount = 90 x 0.3

You save = $27.00

Final Price = Original Price - Discount

Final Price = 90 - 27

Final Price = $63.00

Answer 2

$ 63

Explanation:

Let the new price ( price after the discount ) be x.

Old price Discount New price

100 30 70

90 30 x

Now we can make an expression like this to solve this

100 ⇒ 70

90 ⇒ x

Use cross multiplication to solve for x.

100x = 70 × 90

100x = 6300

Divide both sides by 100.

x = $ 63