An electrician charges a flat fee plus an hourly rate for a service call. She charges a total of $94 for a 3-hour service call on Monday and $130 for a 5-hour service call on Tuesday. How much should she charge for a 2-hour service call?

The two calls differ by 2 hours and $36, so the hourly rate is $36 ÷ 2 = $18. The flat fee is $94 − (3 × $18) = $40. For 2 hours, the total is $40 + (2 × $18) = $76, so the correct choice is C, $76.

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