What was the rate per minute for each additional minute

Question

8-minuet long distance calls that cost

$6.60

$3.75 for the first three minuets

 

Answer 1

$6.60 - $3.75 = $2.85

 

(8-minutes) - (3-minutes) = 5-minutes

 

$2.85 / 5-minutes = $0.57 per additional minute

Answer 2

Let the rate is $x per minute 

 

6.60 = 3.75 + x(8-3)

or , 6.60 -3.75 = 5x 

      5x = 2.85

 hence, x = 0.57

Rate is $ 0.57 per minute