Need to product based on a criteria and then want to sum the whole range

Hi Team,

I have a requirement where I want to product two columns based on a Name criteria and the criteria is "NA".It will multiply only when NA is found in Name.

e.g:Apr-18 col of Overall capcity will be multiplied by Apr-18 column of D&P.Finally I want the total sum and that will be revenue monthwise.Sample sheet attached.

Regards,
Aps

In C14

=SUMPRODUCT(($B$3:$B$12="NA")*(C$3:C$12)*(I$3:I$12))

Copy across