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Solve This Cell Phone Bill Economics Problem If You're A Genius

First Posted: Feb. 6, 2018, 1:12 a.m. CST
Last Updated: Jan. 2, 2019, 1:31 a.m. CST
This is the answer to this math problem. The final solution is at the bottom of the picture. Don't look too closely until you've solved it yourself.

ACT Math Test 6 Problem 14 from

Danielle’s phone plan charges her $30 per month for the first 200 minutes and then $0.10 per minute for each subsequent minute.

Which of the following functions takes an input of any whole number value of x≥200 and outputs the value for f(x) as the amount of dollars Danielle would pay for x minutes of phone usage?

A. f(x) = 0.1x+ 10
B. f(x) = 0.1x+ 20
C. f(x) = 0.1x+ 30
D. f(x) = 0.1x+ 200
E. f(x) = 0.1x+ 230



See picture at top of this page

This article was written by Anna Condor. Anna is a personal trainer and fitness coach. She works out 6 days a week and has a biweekly blog that you can follow. Anna is currently working on a book, and is in the process of establishing a foundation to help individuals and families in developing countries without food or shelter.

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