How to calculate two eval values and display?

Hi 
I have two EVAL values <%#Eval("AMT", "{0:N}")%> and <%#Eval("SAMT", "{0:N}")%>. Now i want to calculate and display the amount in TD. 
If <%#Eval("SAMT", "{0:N}")%> is greater than <%#Eval("AMT", "{0:N}")%> then display Excess = <%#Eval("SAMT", "{0:N}")%> minus <%#Eval("AMT", "{0:N}")%>.
How to compare and display in Repeater?
Thanks
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