Math Assignment Help With Percentage Increase Or Decrease

14.4 Percentage increase or decrease:

Subtract the new amount from the old amount and divide that answer by the old amount, then multiply that answer by 100.

Example of percentage increase:

An item last year cost $450. If it increases this year by 15%, what is its new cost?

Solution: Find 15% of 450 and then add this to 450.

So, (15/100) x 450 = 67.5

Therefore, the new cost is

450 + 67.50 = 517.50

The full explanation of this starts with the first solution from above, which is the original price plus the 15% of it.

450 + 0.15 x 450

This can be written as

1 x 450 + 0.15 x 450

(1+0.15) x 450

1.15 x 450 = 517.50

the skill is reading the question and jumping to the last line.

EXAMPLE: A golf club last year cost $80. Its price is increased by 6%. What is the new cost of the club?

(6/100) x 80 + 80

= 0.6 x 80 + 80

= 48 + 80

= 128

Email Based Homework Help in Percentage Increase Or Decrease

To Schedule a Percentage Increase Or Decrease tutoring session Live chat
To submit Percentage Increase Or Decrease assignment click here.

Following are some of the topics in Percentages And Pie Charts in which we provide help: