I have two rows of data A1 & A2 and that cover the columns a to m.

Jan 12 Feb 12 Mar 12 Apr 12 May 12 Jun 12 Jul 12 Aug 12 Sep 12 Sep 12 Oct 12 Nov 12 Dec 12
1699 2398 2540 1342 2170 3246 1118 2832 2605 2700 2700 2700 2100
276 302 281 288 296 285 311 300 303 285 285 285 285.

row a1 1699 2398
row a2 276 276

I want to multiply A1*A2 and then multiply B1*B2 and add the two figures together. The total should equally 1,193,120.

I would like to do this for the range.

Thanks