Homework Help: math.. again!

Posted by jazz on Saturday, November 1, 2008 at 9:02pm.

write each increase or decrease as a percent.
the price of gasoline rose from 97.5/L to 101.4/L.

Percent increase=

i did:
101.4 - 97.5
101.4 x 0.0390 = 3.9%

is this right?? im not really sure how to do this.sorry for all these questions.

math.. again! - Ms. Sue, Saturday, November 1, 2008 at 9:20pm
To find the percent increase you need to divide the difference between it and the new number by the old number.

101.4 - 97.5 = 3.90

3.9 / 97.5 = 0.04 = 4%

To check it, multiply: 97.5 * 0.04 = 3.90

The price increased $3.90 which is a 4% increase.
- math.. again! - jazz, Saturday, November 1, 2008 at 9:22pm
  thanks so much!! i hate to bother u i have too many questions.:(
  - math.. again! - Ms. Sue, Saturday, November 1, 2008 at 9:41pm
    That's not a problem, Jazz. We are all here to help students and feel good when a student understands something we explain. :-)
  - math.. again! - jazz, Saturday, November 1, 2008 at 9:41pm
    aww ur the best!!! :)))

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