Question

Michael started a savings account with $300. After 4 weeks, he had $350, abd after 9 weeks, he had $400. What is the rate of change?

Answer 1

Explanation:

The initial amount was $300 and the final amount $350. This $50 change occurred in 4 weeks. Thus, the rate of change was

$50

----------- = $12.50/week for the first four weeks

4 wks

For the first nine weeks, the rate of change was

$400-$300 $100

------------------- = ----------------- = $0.11/week.

9 wks 9 wks

Note that this second result makes little sense. Ensure that you have copied this problem down correctly.