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?
50 - 47 = 3
3/50 = 0.06 = 6.0%
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
Right.
Is it always going to be subtraction then division or it all depends on the question what it's asking you for.
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.
To find the percent of decrease, you need to calculate the difference between the two values and then divide it by the original value. After that, you multiply it by 100 to get the percentage.
First, calculate the difference between the original bill and the new bill:
$50 - $47 = $3
Next, divide the difference by the original bill:
$3 / $50 = 0.06
To convert the decimal to a percentage, multiply it by 100:
0.06 * 100 = 6
Therefore, the percent decrease in the telephone bill is 6%.