Ellen purchased a dishwasher, which cost $315 before the 9.22% sales tax. She used the machine an average of 10 times per week for the next six years, at which point she replaced it. Each time she ran the dishwasher it cost her $0.09 for water and $0.13 for electricity. What was the lifetime cost of Ellen's dishwasher?

The dishwasher cost $315 × 1.0922 = $344.04 including sales tax. Over six years, Ellen ran it about 10 × 52 × 6 = 3,120 times, and each run cost $0.09 + $0.13 = $0.22 for water and electricity, totaling $686.40. Adding the purchase price and operating costs gives $344.04 + $686.40 = $1,030.44, choice a.

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