Question

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?
a.
$1,030.44
b.
$686.40
c.
$1,093.73
d.
$749.69

Answer 1

Cost with tax: 315(1 + 0.0922) = 315(1.0922) = 344.043 ≈ $344.04.

Runs: 10/week × 52 weeks/yr × 6 yr = 3,120 runs.
Cost per run = $0.09 + $0.13 = $0.22 → 3,120 × 0.22 = $686.40.

Lifetime cost = 344.043 + 686.40 = 1,030.443 ≈ $1,030.44.

Answer: (a) $1,030.44.