SO the first step you would do in this equation is to subtract 200 by 150:
200 - 150 = 50
Next, you would multiply 0.95 by 50 =
0.95 x 50 = 50.95
Now that we know how much money he for the extra 50 hours we can add 50.95 with 16.95:
50.95 + 16.95 = 67.9
SO Marc's internet bill was $67.90