<PRE><B>Question 811781</B>
pay for miles:
c = 15(m - 100) + 45
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unlimited miles:
c = 7500
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break even:
15(m - 100) + 45 = 7500
15m - 1500 + 45 = 7500
15m = 8955
m = 597 miles
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check #1 pay for miles:
c = 15(597 - 100) + 45
c = 8955 - 1500 + 45
c = 7500 cents = $75.00
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check #2 pay for miles:
c = 15(596 - 100) + 45
c = 8940 - 1500 + 45
c = 74.85 cents = $74.85
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check #3 pay for miles:
c = 15(598 - 100) + 45
c = 8970 - 1500 + 45
c = 7515 cents = $75.15
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at exactly 598 miles it becomes cheaper to buy the unlimited miles
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