Albebra I
posted by Michelle .
bayside insurance offers 2 plans: plan A: pay the 1st $60 + 0.30 of the rest of the bills; plan b = pay 1st $140 + 0.25 of the rest of thebills. For what amount of medical bills will plan B save money? Assume there are over $140 in bills

you want B < A, or A > B
For x dollars in bills,
A = 60 + .3(x60)
B = 140 + .25(x140)
60 + .30x  18 > 140 + .25x  35
.05x > 63
x > 1260
So, for 1260 in bills,
plan A you pay 60 + .3*1200 = 420
plan B you pay 140 + .25*1120 = 420
above that, each dollar of B costs less than for A.
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