Algebra Open Ended Questions

Algebra Open Ended Question….Need Help Please?!?!?10PTS!!!!!?
Trevor gets 500 free minutes every month and the bill comes out to $34.95. Well this month Trevors bill was $44.85. So that means Trevor must have gone over his free minutes. Each over-time minute is 45 cents. How many overtime minutes were used?!?!?!?
I am a little confused on what the end product will be and how you got the answer. Can you please help and explain as best as possible?!?!?
Thanks So Much!!!!
10PTS!!!!!!
44.85 – 34.95 = 9.90 He spent $9.90 on overtime.
Therefore, $9.90 / .45 = 22
He was 22 minutes over
My Guardian Angel 01×15 (A Lolena Story)
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