we have that
the total cost is

In this equation the term 30h represent the cost due to h hours at at unit of 30
and the term 0.040(30h) is equal to calculate the 4% of (30h)
so
in this problem the tax rate is equal to 4%
therefore
<u>the answer is</u>
The term 0.040(30h) represents the amount of tax she must pay
Answer:

Step-by-step explanation:
<u>Step 1: Determine the unit rate</u>



<u>Step 2: Determine the amount of gasoline used for 216 miles</u>


Answer: 
It is 9lt-2w-27! Hope it helped!