I have a worksheet that I used VLOOKUP to find price of item from dropdown. Now the owner wants that cell to also multiply that price by a quantity. Separately I know the formulas, but can't figure out how to combine them. My formulas separately are:

=IF(ISERROR(VLOOKUP(B11,List!P2:Q79,2,FALSE)),"0",(VLOOKUP(B11,List!P2:Q79,2,FALSE)))

=IF(A11="",H11,A11*H11) [this formula doesn't completely work as it errors if no quantity is provided, but I couldn't figure the correction to this either]

My apologies to those shaking your heads at my lack of knowledge, I'm learning as I go.

Thank you for your help,