Percentage Calculation

Discounts and Sales Tax

100

What is the final price of an item originally costing $80 with a 20% discount?

$80 - (20% of $80) = $80 - $16 = $64

200

If the sales tax rate is 8% and you buy a shirt for $25, how much tax will you pay?

Tax = 8% of $25 = $25 * 0.08 = $2

300

A pair of shoes is on sale for 25% off its original price of $60. What is the sale price?

Sale price = $60 - (25% of $60) = $60 - $15 = $45

400

You purchase a book for $15. After a 10% discount, what is the final cost?

Final cost = $15 - (10% of $15) = $15 - $1.50 = $13.50

500

Sara wants to buy a Nike backpack. She finds a $40 backpack at a discount of 10%. If the sales tax rate is 6%, how much will she pay in total?

$38.16

Part of a Whole

100

225% of 15?

2.25 X 15 = 33.75

200

What is 40% of 80?

40% of 80 = 0.40 * 80 = 32

300

If 15% of a school is absent, school is cancelled. If there are 768 students in the school, how many students must be absent to cancel school?

115.2 OR 115

 

400

20% of 30?

30 x 0.2 = 6

500

If 63.6% of a budget is allocated for supplies, and the total budget is $30000, what is the dollar amount allocated to supplies?

30000 * 0.636 = 19080

Whole of a Part

100

If 40 is 20% of a number, what is the number?

Number = 40 / (20/100) = 200

200

25 is what percentage of 50?

50%

300

If 15 is 30% of a number, what is the number?

15 / (30/100) = 50

400

12 is 113% of what number?

10.6 OR 11

500

If 75% of a number is 326, what is the number?

434.7 OR 435

Percent Increase and Decrease

100

If a shirt originally costs $20 and is now $25, what is the percent increase?

Increase = ((25 - 20) / 20) * 100 = 25%

200

 If a plant grows from 20cm to 24cm, what is the percent increase?

Increase = ((24 - 20) / 20) * 100 = 20%

300

If the price of a phone decreases from $400 to $360, what is the percent decrease?

Decrease = ((400 - 360) / 400) * 100 = 10%

400

If the population of a town drops from 6000 to 5400, what is the percent decrease?

Decrease = ((6000 - 5400) / 6000) * 100 = 10%

500

An investment of $800 increases 132% in one year. The next year it increases by a percentage to a total of $2134.40. What was the percentage increase in the second year?

15%

Converting Decimals, Fractions and Percentages

100

Convert 0.78 to a fraction.

78/100 = 39/50

200

Convert 8/17 into a decimal

0.47

300

Convert 64% into a fraction

0.64/1 = 64/100 = 32/50 = 16/25

400

Convert 0.0052 to a percentage.

0.52%

500

Convert 0.08% to a fraction

0.0005/1 = 5/10000 = 1/2000