Concat string with arithmetic operation in rdlc c#

Question

Hello all

I am working on rdlc report in c#. It was a billing report and I want to show the unit rate and unit amount together with a new line in between them.

 

I use the following formula but no luck

 

=Fields!Rate.Value & Environment.NewLine & (First(Fields!Qty.Value * Fields!Rate.Value)) 

 

by using the above formula it concatinates the whole numbers

 

How can I solve that?