getting an error for line of code both for decimal as well as int

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.NET

C#3.5

.NET4.5

hey I have following code

return string.Format("{0} (${1} EE ${2} DEP to Any Plan)",
                       _excelResource.GetValue("EMPLOYERCOST", languageId),
                      _excelService.CheckNull(bundle, m => m.EmployerContribution.ContributionAmount.Amount.Employee),
                      _excelService.CheckNull(bundle, m => m.EmployerContribution.ContributionAmount.Amount.Dependent));

from gui when amount insert is 100
it should display 100 and when amount insert 150.75 it should display 150.75.

with above code i am getting result 100.00 and 150.75

if i apply math.round then also no effect and not even convert.to decimal

.....what code should be there so that in different scenario i get the same result as inserted in gui.

amount are for calculation purpose.

help will be highly appreciable