Question

a computer shop charges 20 pesos per hour (or a fraction of an hour) for the first two hours and an additional 10 pesos per hour for each succeeding hour. Find how much you would pay if you use one of their computers for:

(A) 3 hours
(B) 150 minutes​

Answer 1

Answer:

I think the answer is...

A,. 20*3 = 60

= 60+30 = 90 pesos (for succeeding the hour)

B,. 150 min= 2½ hours

20*2+10= 50

50+ 20= 70 pesos

Answer 2

Given : a computer shop charges 20 pesos per hour (or a fraction of an hour) for the first two hours and

an additional 10 pesos per hour for each succeeding hour.

To  Find :  how much you would pay if you use one of their computers for:

(A) 3 hours

(B) 150 minutes​

Solution:

Situation can be represented using a piece wise function

let say h denotes the number of hours

and C represents the cost in pesos

C = 20h    if   0 < h ≤ 2

C = 20h  + 10 ( h - 2)    if  h > 2  

  = 30h  - 20   if  h > 2  

C = 20h  ,  0 < h ≤ 2

     30h - 20   , h > 2

h = 3 hours    h > 2

=>  C = 30(3) - 20  = 70   pesos

150 mins = 2.5 hrs  

2.5 > 2

C = 30(2.5)  - 20

  = 75 - 20

  = 55

Cost for 3 hours = 70   pesos

Cost for 150 minutes​ =55   pesos

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