Final answer:
To find the percent increase from 15 friends to 19, calculate (19 - 15) / 15 × 100, which results in 26.67%. Rounded to the nearest percent, the increase is 27%.
Step-by-step explanation:
To calculate the percent increase, you need to subtract the original number of friends from the new number of friends, then divide the result by the original number and multiply by 100 to convert it to a percentage.
Here's how you apply the formula in this case:
- Change in number of friends = 19 - 15 = 4
- Original number of friends = 15
- Percent increase = (4/15) × 100 = 26.67%
When you round 26.67% to the nearest percent, you get 27% as the percent increase from 15 to 19 friends.