Enter the revenue and expense figures from your individual sale data. Enter the discount percent as a whole number; you MAY enter a decimal for percent in that IF you wish to have 30 and a half percent as the discount value, it would be entered 30.5 in the discount value field. Click the Calculate button; read the sale profit, profit margin and the profit markup from both the discounted and normal sale results. You may click on Clear Values and do another. You MAY enter a decimal for data in the revenue and expense fields but do not enter any commas or dollar signs (, or $). Sale profit and gross profit are somewhat synamous but are different from net profit. These expenses are ONLY for sale related expense while ALL expenses are taken into account with net profit.