WHO EVER ANSWERS FIRST WILL GET A BRAINLY!!!!!!PLS BE QUICK

You call a taxi company to find out their rates. The taxi company charges $1.50 for the first mile, and $.90 for each additional mile. How far could you go for $20 if you give the driver a $2 tip? Write your answer, then write a written explanation of how you got your answer. Explain your steps in complete sentences! ​