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using System;
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decimal CalculateTotal(decimal itemTotal, bool addTax = false)
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{
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decimal tax = 10.0m; // Call the tax service.
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return addTax ? itemTotal + tax : itemTotal;
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}
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Console.WriteLine(CalculateTotal(10.0m, false));
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Console.WriteLine(CalculateTotal(10.0m, addTax: false));
Cached Result