I am using the following formula to perform operations on two data series
The formula is in cell E7 all values are numeric.
=100*SUMPRODUCT(D7:D8,(A8-A7:A8))
Here is the product sum that I need (notice it is NOT the same as produced from the function above.
100 *( (D8 * A8-A7) + (D7 * A8-A8) )
I tried the following and looked in help to no avail
=100*SUMPRODUCT(D8:D7,(A8-A7:A8))
The above formula simply reverts to the one up top.
how do I reverse the order of the "D" series in this funtion?
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