Can someone help me understand this arithmetic expression? :
"In 2001 Harper College charged $55 per credit hour. Find the total bill for a student who takes 15 credit hours and pays a $75 activity fee."
The answer choices are:
(1) 55+75+15
(2) 75+15x55
(3) (75+55)x15
(4) 75x55x15
(5) 55x15-75
The answer is (2). Which is really confusing.

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Yes, I understand now. Thank you. I kept subtracting the $75 activity fee instead of adding it.

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