Answer:
Total bill = 39.6$
Explanation:
Christopher has breakfast at a cafe and the cost of his meal is $36.00
Cost of meal = 36 $
Percentage of tip = 10
Cost of tip is given by

Cost of tip = 3.6 $
Total cost = Cost of meal + Cost of tip = 36 + 3.6 = 39.6$
Total bill = 39.6$