Question 97525
Let "m" be the number of miles driven in day 
Given Charges per mile = $.22
Charges for driving m miles = $(.22*m)

Total rental for the day is $(15 + .22m) where m is thenumber of miles driven in a day

Cost when 300 miles are driven in a day = $(15 + .22*300)
 =$(15+ 66)
 =$81