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%.
Again, gross margin is just the direct percentage of profit in the sale price. In accounting, the gross margin refers to sales minus cost of goods sold. It is not necessarily profit as other expenses such as sales, administrative, and financial must be deducted.ross Margin (%) = (Revenue â Cost of goods sold) / Revenue. It can be expressed in absolute terms: Gross margin = net sales â cost of goods sold + annual sales return. or as the ratio of gross profit to revenue, usually in the form of a percentage: