Question

A payphone booth charges a customer Php 8.00 for local calls that do not exceed 10 minutes. If a call lasts longer than 10 minutes, an additional payment of Php 0.75 per minute will be charged.

How much will be paid for an 8-minute call?


pls pa help po. thanks​

Answer 1

Php 8.00 is the answer as the call does not exceed 10 minutes

Answer 2

Given :

A payphone booth charges a customer Php 8.00 for local calls that do not exceed 10 minutes.

If a call lasts longer than 10 minutes, an additional payment of Php 0.75 per minute will be charged.

To Find :  How much will be paid for an 8-minute call?

Solution:

Let say t represent the time of call in minutes

C(t) represents the cost of call

C(t)  =  8         0 < t  ≤ 10

      = 8  + 0.75(t - 10)   10 < t

8  + 0.75(t - 10)   = 0.75t  + 0.5

C(t)  =  8         0 < t  ≤ 10

      = 0.75t  + 0.5   10 < t

Stepwise function is :

$\left \{ {{8 \quad~ \quad 0 < t \leq 10 \atop {0.75t+0.5\quad 10<t}} \right.$

8-minute call  t = 8

8 lies between 0 and 10  

hence from the step function cost  is   8 Php

Cost is  8 Php for  an 8-minute call

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