Question 1 Answer & Explanation - SAT Algebra

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algebra

A phone plan charges $20 monthly plus $0.05/min. Another plan charges $0.10/min with no monthly fee. When is the first plan cheaper?

Less than 200 mins

Less than 400 mins

More than 200 mins

More than 400 mins

Correct Answer: D

Choice Ahoice D is the correct answer.

Inequality: $20 + 0.05x < 0.10x$
Subtract 0.05x: $20 < 0.05x$
Divide by 0.05: $400 < x$ or $x > 400$

Choice Ahoice C is incorrect because inequality direction.

Choice Ahoice D is incorrect because calculation error.

Choice Ahoice B is incorrect because calculation error.

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Linear Functions Set 39

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