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Answer:
Step-by-step explanation:
You want the discount amount and the price after 6% tax when a 15%-off coupon is applied to an order of $31.80.
The value of the coupon is ...
15% × $31.80 = $4.77
They get a discount of $4.77 from the coupon.
The amount of tax is ...
($31.80 -4.77) × 6% = $27.03 × 0.06 = $1.62
So, the total bill is ...
$27.03 + 1.62 = $28.65
The total price after tax is $28.65.