Decimals & Percents · Percent in the real world · 7.2

Discount & sale price.

A discount is a percent off the price. Find the discount (percent of the price), then subtract it. 25% off $80: 0.25 × 80 = $20 off → $60. Or pay 75% of $80 directly.

01 / THE IDEA

See it work.

Watch the method

Discount & sale price

25% off $80 → $60.

1 / 2
$80 , 25%\$80 \text{ , } 25\%
1

Find the discount

25% of $80 = $20.00 off.

25%×80=20.0025\% \times 80 = 20.00
2

Subtract from the price

Sale price = original − discount.

=$60.00= \$60.00
02 / YOUR TURN

Practice until it feels automatic.

Your turn

Work it out.

Type dollars, e.g. 12.50.

streak 0
best 0
… =$
— / WHY IT WORKS

The idea underneath.

Off the price

Compute the discount amount and subtract, or multiply by (100% − the discount).

Why it works

25% off means you pay 75%.

03 / WORKED EXAMPLES

From easy to tricky.

EX 1easy

A $190 item is 25% off. What is the sale price?

1

Find the discount

25% of $190 = $47.50 off. 25% × 190 = 47.50

2

Subtract from the price

Sale price = original − discount. = $142.50

EX 2medium

A $60 item is 25% off. What is the sale price?

1

Find the discount

25% of $60 = $15.00 off. 25% × 60 = 15.00

2

Subtract from the price

Sale price = original − discount. = $45.00

EX 3hard

A $100 item is 20% off. What is the sale price?

1

Find the discount

20% of $100 = $20.00 off. 20% × 100 = 20.00

2

Subtract from the price

Sale price = original − discount. = $80.00

04 / COMMON TRAPS

Where students slip.

Trap

Forgetting to subtract the discount.

Fix

The discount comes OFF the price.

Trap

Taking the percent of the wrong amount.

Fix

The percent is of the original price.

05 / QUIZ

Test yourself.

The Test

12 problems across three tiers. Auto-graded on submit. Hints and a full walkthrough on every question. Your work is saved on this device — sign in to keep it across devices.

0/12Answered
How to answerType just the value. Formatting won't trip you up — we ignore spaces, capital letters, commas, and subscript style, so t₁ = 5, d = 3 and t1=5,d=3 both count. For a list of numbers, separate them with commas (e.g. 3, 10, 17).
Core

Core (4)

C1

A $20 item is 20% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
C2

A $180 item is 20% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
C3

A $30 item is 10% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
C4

A $170 item is 10% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
Apply

Apply (4)

A1

A $190 item is 20% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
A2

A $170 item is 50% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
A3

A $40 item is 50% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
A4

A $150 item is 10% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
Extension

Extension (4)

E1

A $120 item is 20% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
E2

A $120 item is 25% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
E3

A $140 item is 50% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.
E4

A $150 item is 50% off. What is the sale price?

Need a hint?
  • Find the percent of the price.
  • Subtract it from the price.