Question

a repair job took 4 h and 15 min and required $390 in parts. what is the total cost

Answer 1

Answer:

h = 2.5

Step-by-step explanation:

note that, if you multiply a rate by the time, you'll get the fee for that amount of time.

He worked 3 regular hours at $30 per hour, so he would charge 3.30 or $90 for the regular work.

He worked h overtime hours at $42 per hours, so he would charge h-42 or $42h for the overtime work.

The total fee of $390 is the sum of the regular hours, the overtime hours, and the cost of the parts, so we add those there amounts and set them equal to the total.

0 + 42h + 195 = 390 .

42h + 285 = 390

42h = 105

h = 2.5

Answer 2

Given: The linear function f(t)= 30+60t. A repair job took 4 h and 15 min and required $390 in parts.

To find: The total cost.

Solution: The total cost is Rs. 285.

The linear function given in the question is written as follows.

$f(t)= 30+60t$

Here, t is the time that had been taken for the repair job to be completed. The time 4 hours and 15 minutes can be written as follows

$4 + \frac{15}{60} =4.25 \: hours$

Now, the value of t can be substituted in the linear function and the total cost of the repair job can be calculated.

$f(t)= 30+60(4.25)$

       $= 285$

Therefore, the total cost is Rs. 285.

Although part of your question is missing, you might be referring to this full question:  

The linear function f(t)= 30+60t. A repair job took 4 hr and 15 min and required $390 in parts? What is the total cost?