What is the difference between gross profit percentage and net profit margin percentage?

Gross Profit percentage:  Gross profit  expressed as a percetage of Total  Net Sales Revenue (Efficiency ratio interms of Production and Sales)

Net Profit Margin Percentage:   Net profit Margin (after providing for all seeling and administration expenses +after taxes to the revenue) as a percentage of Total Net Sales Revenue (and is a Financial Ratio)

for my understanding gross profit means the amount you put out for your business and net profit means to me the amount returned to you   .... i think so

The net profit percentage shows how much money is left, after paying expences from running the business, as a percentage.

The Gross Profit Margin is an expression of the Gross Profit as a percentage of the Revenue, where the Gross Profit is the Sales minus Cost of Sales

Gross margin is the difference between revenue and cost before accounting for certain other costs. Generally, it is calculated as the selling price of an item, less the cost of goods sold (production or acquisition costs, essentially