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%.
Q&A. Gross margin or gross profit is defined as sales minus cost of goods sold. If a retailer sells a product for $10 which had a cost of $8, the gross profit or gross margin is $2. The gross profit ratio or the gross margin ratio expresses the gross profit or gross margin amount as a percentage of sales.