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using System.Collections.Generic;
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using System.Linq;
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using Yavsc.Billing;
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namespace Yavsc.Helpers
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{
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public static class BillingHelpers
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{
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public static decimal Addition(this List<IBillItem> items) => items.Aggregate<IBillItem, decimal>(0m, (t, l) => t + l.Count * l.UnitaryCost);
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}
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}
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