Posted by **Chayo** on Wednesday, July 8, 2009 at 11:37am.

Round your answer to the nearest tenth of a percent.

By switching service providers, a family's telephone bill decreased from about $50 a month to about $47. What was the percent of decrease?

- MATH -
**Ms. Sue**, Wednesday, July 8, 2009 at 11:41am
50 - 47 = 3

3/50 = 0.06 = 6.0%

- MATH -
**Chayo**, Wednesday, July 8, 2009 at 11:47am
So what you should do first is always subract then divide what ever answer you got by 50 for instance in this problem it was decreased from 50. So we are trying to figure out what was the decrease in 47. right

- MATH -
**Ms. Sue**, Wednesday, July 8, 2009 at 11:52am
Right.

- MATH -
**Chayo**, Wednesday, July 8, 2009 at 11:54am
Is it always going to be subtraction then division or it all depends on the question what it's asking you for.

- MATH -
**Marth**, Wednesday, July 8, 2009 at 3:13pm
When finding a percentage change, you will need to divide the magnitude of increase by the prior value.

The magnitude of increase may be given, or you may have to find it, by subtracting 50-47 in this case.

The prior value is given as 50.

Then, divide to find the percent change.

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