Question 202719
For the first part, you're on the right track. However, in the third to last step, you made a very silly typo which gave you the wrong answer. The term "45.70" should be "45.50" which would give you the answer of {{{x>2450}}}. So if her bills are more than $2,450, then she'll save with plan B


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For the second part, simply plug in 5000 in for x into both expressions to get:


Plan A: {{{70+0.35(5000-70)=70+0.35(4930)=70+1725.5=1795.5}}}


Plan B: {{{240+0.30(5000-240)=240+0.30(4760)=240+1428=1668}}}



So with a bill of $5,000, she pays $1,795.50 under plan A or $1,668 under plan B (this supports the answer to the first part)