Problema Solution
In January 1983, Anna starts a new job and makes an annual salary of $38,000. By January 1986 her annual salary has increased to $46,000, and by January 1990 it has increased to $133,700. What is the average rate of change of her salary between January 1986 and January 1990?
Answer provided by our tutors
The increase of the salary between 1986 and 1990 was:
$133,700 - $46,000 = $87,700
The period of time between 1986 and 1990 is 1990 - 1986 = 4 years:
The average rate of change per yeas is: 87,700 : 4 = $21,925 per year.