Percentage and deluge

Percentage and deluge

I am trying to update a commision value field with certain values based on two parameters, but are not doing this correct as getting errors, have not been able identify exactly how I need to code same in the help section hence reaching out here.

What i want to achieve in this case is when Pay At equals DEBRVTM and Currency equals USD the ADDCOMPCT should update to read 1.5%

The two determining fields are radio buttions and the ADDCOMPCT field is percemt field.

Current code as below.

if ((input.Pay_At  ==  "DEBRVTM")  &&  (input.Currency  ==  "USD"));
{
    input.ADDCOMPCT = "1.5";
}