new column from manipulate other columns

hi

how can i create a column from manipulate other columns?

for example we have 2 columns: number of years and month and we want new column "total month" that achive from those

ex: year=2 and moths=6   total months=2*12+6=30

thanks

With the Math Formula node. https://www.knime.org/files/nodedetails/_misc_Math_Formula.html