Multiply with a specific number

I have a question in which the answer is the annual income (Variable name: Annual).
In the next question I want to multiply this variable with the number 0.05.
Something like that (Annual*0.05). Is there any solution for this? I compiled it but it appeared a syntax error [WB0027].

Please explain your question better.

Are you trying to create a new variable which is a product of Annual x 0.05 and this results in an error, or you are doing something else.