Question

1. last year, 140 people in a community had cell phones. this year, the number of people in the community with cell phones has increased by 65%. a. what is the percent of increase? b. what is the change in the number of people with cell phones? c. how many people in the community have cell phones this year?

Explanation:

Step1: Identify percent of increase

The problem states it has increased by 65%, so the percent of increase is 65%.

Step2: Calculate change in number

Multiply last - year's number by the percentage increase. The formula is $\text{Change}=140\times\frac{65}{100}$.
$140\times\frac{65}{100}=140\times0.65 = 91$

Step3: Calculate this - year's number

Add the change to last - year's number. The formula is $\text{This year's number}=140 + 91$.
$140+91=231$

Answer:

A. 65%
B. 91
C. 231