Question

for a school project, anne is investigating cell phone use in her hometown, stamford. so far, she has found that the residents of stamford used their cell phones for 4,110 minutes last year. this year, they used their cell phones for a total of 2,794.8 minutes. what is the percent of decrease in annual usage?

%

Explanation:

Step1: Find the decrease in minutes

To find the decrease, subtract this year's usage from last year's usage.
$4110 - 2794.8 = 1315.2$

Step2: Calculate the percent decrease

The formula for percent decrease is $\frac{\text{Decrease}}{\text{Original Amount}} \times 100\%$. Here, the original amount is last year's usage (4110 minutes) and the decrease is 1315.2 minutes.
$\frac{1315.2}{4110} \times 100\% = 0.32 \times 100\% = 32\%$

Answer:

32%