I can't believe there isn't an easier way to do this ...
I have my data set up as follows:
<tbody>
Jan-17
Feb-17
Mar-17
Apr-17
Revenue beginning month
100
105
110
115
Gains
10
10
10
10
Losses
(5)
(5)
(5)
(5)
Revenue end of month
105
110
115
120
</tbody>
The list of columns...