Question

Suppose a 5-mintue overseas call costs 6.45 and a 10-minute calls costs 11.40. The cost of a call and the length of a call care related. Write an equation to show the cost of a call for any duration. Approximately how long can you talk on the phone if you have $51 to spend?

Answer 1

The Equation for this is given as

C = $0.99x + $1.50

Where x = number of minutes

C = Cost of the call

If you have $51 to spend , the duration of the call is approximately 50 minutes

Explanation:

Step 1

The difference in the cost of the calls is calculated as:

$11.40 - $6.45

= $4.95

The cost for a 5 minute call is calculated as:

$4.95 ÷ 5 = $0.99

Extra charges for the 5 minutes call =

$6.45 - $4.95 = $1.50

The Equation for this is given as

C = $0.99x + $1.50

Where x = number of minutes

C = Cost of the call

If you have $51 to spend, the number of minutes you would get is :

$51 = $0.99x + $1.50

$51 - $1.50 = 0.99x

$49.50 = 0.99x

x= $49.50/0.99

x = 50 minutes

Therefore, If you have $51 to spend , the duration of the call is approximately 50 minutes.