SOLUTION: Plan a Giselle pay the first$90 of her medical bills, plus 30% of the rest. Plan b giselle pay the first $100, plus 20% of the bill. assume she has over $100 in bills. What amou

Question 550502: Plan a Giselle pay the first$90 of her medical bills, plus 30% of the rest. Plan b giselle pay the first $100, plus 20% of the bill. assume she has over $100 in bills. What amount of medical bills will plan b save Giselle money.
Answer by fcabanski(1391) (Show Source): You can put this solution on YOUR website!
A: G pays 90 + .3(x-90)
B: G pays 100 + .2x
In each case X is the total bill. In A, she pays 30% of the remainder of the bill which is x-90. In B, she pays 20% of the bill in addition to the $100.

Find when B is cheaper by finding when B is < A.

90 + .3(x-90) > 100 + .2x

90+.3x-27 > 100 + .2x

.1x > 37

x > 370

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