First find the reduce price (based on the 10% sale - i.e this means if the cost is reduced to 90% of its original non-sale price)
Then subtract another $75 due to the coupon to obtain the end cost:
$575.25*(1-0.10) - $75 = $442.73
Answer is: $442.73
Sara's cost for the swimming pool before tax is $442.73 after applying both the 10% discount and the additional $75 coupon. First, we calculated the reduced price after the discount, then subtracted the coupon amount. The final amount before tax is $442.73.
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