An airport limo service charges riders a fixed charge of $15 plus $4.00 per mile. How many miles must a rider go to have an
average cost per mile of $4.60?

Given:

An airport limo service charges riders a fixed charge of $15 plus  $4.00 per mile.

To find:

Distance in miles must a rider go to have an  average cost per mile of $4.60.

Solution:

Let x be the number of miles the rider travel.

Total charges = Fixed charges + Variable charges

According to the question,

Fixed charges = $15

Variable charges = $4x

So,  total charges

Divide the total charges by number of miles to get the cost per mile.

Average cost per mile is $4.60.

Divide both sides by 0.60.

Therefore, the required number of miles is 25.

50-38=12

step-by-step explanation: