Conditional product of sum

Maybe I should say conditional product of conditional sum.
Eitherway, the values in column J are summed if P is column R for the repective row.

=SUM(IF($R$5:$R$246="P",(J$5:J$246),IF($R$5:$R$246=" ",(J$5:J$246))))

Now, I'm confused on how to change my formula to multiply the result above
by the value in column Q for the same respective row.


anyhelp in setting up the formula is appreciated.

TIA,

bdb