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Answer:
$344.05
Step-by-step explanation:
The markdown multiplies the price by (1 -40%) = 0.60.
$521.28×0.60 = 312.768 ≈ $312.77
The tax multiplies the price by (1 +10%) = 1.10.
$312.77×1.10 = $344.047 ≈ $344.05
The total cost of the surfboard was $344.05.