WORKED EXAMPLES
Real problems, solved step by step.
A $89.99 jacket is 30% off. What do you pay?
Savings: 89.99 × 0.30 = 27.00
Price: 89.99 − 27.00 = 62.99
$62.99
You scored 42 out of 60 on a test. What percent is that?
42 ÷ 60 = 0.7
0.7 × 100 = 70
70%
Rent went from $1,400 to $1,550. What is the increase?
1,550 − 1,400 = 150
150 ÷ 1,400 × 100 = 10.71
10.71% increase
A $64.50 dinner bill with an 18% tip, split by two?
Tip: 64.50 × 0.18 = 11.61
Total: 76.11 ÷ 2 = 38.06
$38.06 each
QUICK REFERENCE
Common percentages as fractions and decimals.
| Percent | Fraction | Decimal | Of 100 |
|---|---|---|---|
| 5% | 1/20 | 0.05 | 5 |
| 10% | 1/10 | 0.1 | 10 |
| 12.5% | 1/8 | 0.125 | 12.5 |
| 20% | 1/5 | 0.2 | 20 |
| 25% | 1/4 | 0.25 | 25 |
| 33.33% | 1/3 | 0.3333 | 33.33 |
| 50% | 1/2 | 0.5 | 50 |
| 66.67% | 2/3 | 0.6667 | 66.67 |
| 75% | 3/4 | 0.75 | 75 |
| 100% | 1/1 | 1 | 100 |