Arturo O. answered 11/10/17
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C = cost
Original price: $214
Price discounted by 35%: ($214)(1.00 - 0.35) = $139.10
6% sales tax on discounted price: 0.06($139.10) ≅ $8.35
C = discounted price + tax = $139.10 + $8.35 = $147.45
You can also work this in one step:
C = ($214)(1.00 - 0.35)(1.06) ≅ $147.45