Michael is the city sales manager for "Chick-Stick," a national fast food franchise. Every working day, Michael drives his car as follows:
Miles
Home to office 20
Office to Chick-Stick No. 1 15
Chick-Stick No. 1 to No. 2 18
Chick-Stick No. 2 to No. 3 14
Chick-Stick No. 3 to home 30
what Michael's deductible mileage is ?