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%.
There are several measurements of profit, including gross profit, operating profit and net profit. Gross profit is sales less the cost of goods sold. Cost of goods sold includes materials, labor and overhead. Operating profit is gross profit less sales expense, general expense and administrative expense. Net profit is operating profit less interest, taxes and other expense. Profit measurements are sometimes referred to as margins and are expressed as a percentage by dividing profit dollars by sales.