Next determine your total sales. Add up 100 400 600 1100. To start subtract the net sales of the prior period from that of the current period.
This will be the total sales of all items sold by your business.
Determine the whole or total amount of what you want to find a percentage forFor example if you want to calculate. Drag the formula down to the other cells in the column by clicking and dragging the little icon at the bottom-right of the cell. Click on pivot builder the entry Sum of Sales and select Value Field Settings. For example if you paid 50 for a lamp and the local sales tax rate is 9 divide 50 by 109.