multiplying time with whole number

FUNCTION [dbo].[GetTotalSalary1_func] 
(
	@emplID int,
	@month VARCHAR(50) = NULL
)
RETURNS int
AS
BEGIN
	Declare @BSalaryHour int, @TotalSalary int, @TotalHoursWorked int
		     Set @TotalHoursWorked = (Select OverallTime from MonthlyRecord where EmplID = @emplID AND Month = @month )
		Set @TotalSalary = @BSalaryHour * @TotalHoursWorked
		--------------------------------------------------------------------------------------
	
	-- Return the result of the function
	RETURN @TotalSalary

END

select dbo.GetTotalSalary1_func(5,'2013-dec')

Set @TotalSalary = @BSalaryHour * @TotalHoursWorked