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%.
Gross Margin Definition. Gross profit margin is the simplest and most basic margin calculation. It equals revenue minus cost of goods sold, divided by revenue. It shows how well the company gets good deals on purchases and turns them into high revenues. If the company generates $10,000 in revenue with COGS of $7,000, its gross profit is $3,000. Dividing $3,000 by $10,000, you get .3, or 30 percent for gross margin.