Percentage Change Word Problems

Front

A shirt originally costs $50. If the price increases by 20%, what is the new price?

Back

Solution:

M1:

100% + 20% = 120%

50 x 120/100 = $60

M2:

20% x 50 = 20/100 x 50

= $10

$50 + $10 = $60

Front

A car was bought for $20,000 and its value increased by 15%. What is the new value of the car?

Back

Solution:

M1:

100% + 15% = 115%

$20 000 x 115/100 = $23 000

M2:

15% of $20 000 = $3 000

$20 000 + $3 000 = $23 000

Front

A laptop was priced at $800 but is now on sale for 25% off. What is the sale price?

Back

Solution:

Method 1

100% - 25% = 75%

$800 x 75% = $800 x 75/100

= $600

Method 2

$800 x 25/100 = $200

$800 - $200 = $600

Front

The price of a computer system decreases from $1250 to $1050. Find the percentage decrease in price.

Back

Solution:

change = new value - originL value

= $1050 - 1250

= -200 (negative, decrease)

% decrease = (decrease / original) x 100%

= (200/1250) x 100 %

= 16%

Front

Thank you!

Back

Thank you!