Instead of thinking about one field changing in response to the change of the other, it is more correct to say that. whenever the magnetic field is changing, so is the electric field, and vice versa.The way these fields change is governed by Maxwell's equations.This way, we do not arrive at the confusion OP has.nstead of thinking about one field changing in response to the change of the other, it is more correct to say that. whenever the magnetic field is changing, so is the electric field, and vice versa.
Gross profit = net sales â cost of goods sold. Gross profit percentage = [(net sales â cost of goods sold)/net sales] Ã 100%.
A company's total revenue (equivalent to total sales) minus the cost of goods sold. Gross profit is the profit a company makes after deducting the costs associated with making and selling its products, or the costs associated with providing its services.ross profit is expressed as a currency value, gross profit margin as a percentage. The formula for gross profit margin is: Gross profit margin = gross profit / revenue = (revenue-cost of goods sold) / revenue. Gross profit margins vary greatly by industry.