Question

In the United States, the average public school teacher currently earns an annual salary near $55,202. Reported national average salaries for the last six decades are listed below. Year National Average Teachers’ Salary 1960 $4,995 1970 $8,626 1980 $15,970 1990 $31,367 2000 $41,807 2010 $55,202 Determine the average change per year in teachers’ salaries for the last fifty years. $836.78 $1,004.14 $50,207.00 $1,203.94

Answer 1

By definition, the average exchange rate is given by:

`AVR = (y2 - y1)/(x2 - x1)`
Substituting values we have:

`AVR = (55202 - 4995)/(2010 - 1960)` Rewriting we have:

`AVR = (50207)/(50)`

`AVR = 1004.14`
Answer:
the average change per year in teachers' salaries for the last fifty years is:

`AVR = 1004.14`

Answer 2

Option B is correct.

Explanation:

The salary for the year 1960 = $4995

The salary for the year 2010 = $55202

Number of years between 1960 to 2010 = 2010-1960=50

So, average change will be = Difference in salaries of both years divided by difference in number of years(50)

`(55202-4995)/(50)`

= 1004.14

So, option B is correct.