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N 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 salary increase per year between the years 1980 and 1990. $1,539.70 $8,367.80 $2,566.20 $1,004.10

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Answer:

$1,539.70

Step-by-step explanation:

Given the data :

National average Teachers' salary (NATS)

YEAR:_1960 _ 1970 _ 1980 _ 1990 _ 2000 2010

NATS:4995_8626_15970_31367_41807_55202

AVEAGE SALARY INCREASE PER YEAR BETWEEN 1980 and 1990

Salary in 1980 = $15970

Salary in 1990 = $31367

Average salary increase per year:

Difference in salary / difference in years

$(31367 - 15970) / (1990 - 1980)

= $15397 / 10

= $1539.7

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