2000 AMC 10 Problem 4

Problem 4 of 25EasierAlgebra

Chandra pays an on-line service provider a fixed monthly fee plus an hourly charge for connect time. Her December bill was

\$12.48,

but in January her bill was

\$17.54

because she used twice as much connect time as in December. What is the fixed monthly fee?

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Solution

January doubled only the connect time, so the increase

\$17.54 - \$12.48 = \$5.06

equals December’s connect-time cost. The fixed monthly fee is therefore

\$12.48 - \$5.06 = \$7.42.

Thus, the correct answer is D.