How to round up the value end with Zero in asp.net mvc5?

Question

Hi i need to round up to Zero Value (end value to be 0, like 450, 55000, 4560). Hi i want to round up the value with ending zero eg if i got value like 102498 means 102500 and if i got value like 47504 means 47500 this i have to do in mvc

eg values

999 =>1000

994=>990.

995=>990

I want to round up the value and end value is zero of each one

My View Code

<table class="table table-bordered table-striped mb-none" id="tblTestDetails">

<thead>

<tr>

<th>Test Name</th>

<th>Total hrs</th>

<th>Rate/Hr</th>

<th>Margin</th>

<th>Discount</th>

<th>Total Cost</th>

<th>Total Cost With Discount</th>

<th>Remarks</th>

</tr>

</thead>

<tbody>

@{double totRC = 0.0, totCost = 0.0, totWithDisc = 0.0, TotalRatecardcost = 0.0;}

@if (Model != null && Model.TestDetails != null && Model.TestDetails.Count > 0)

{

foreach (var item in Model.TestDetails)

{

cnt++;

<tr>

<td>@item.TestName</td>

<td>@item.TotalHours</td>

<td class="amt-field">@item.PerHourRate</td>

<td>@item.Margin)</td>

<td>@item.Discount)</td>

<td class="amt-field">

@{double totamt = item.PerHourRate * item.TotalHours;

totRC += totamt;

totamt += totamt * item.Margin * 0.01;

totCost += totamt;

}

@Math.Round(totamt)

</td>

<td class="amt-field">

@{double totamtWithDisc = totamt - (totamt * item.Discount * 0.01);

totWithDisc += totamtWithDisc; }

@Math.Round(totamtWithDisc)

</td>

<td>@item.Remarks</td>

<td>

</tr>

</tbody>

</table>

In the above table i have to round off the **TOTAL COST VALUE** .Please any one understand my issue help me to resolve this issue.Thanks.