In May 2021, Green & co produced 2.000 units at a cost of N$3/unit and sold 1,500 units at N$5.00/ unit. From the production process, the company produced 500 units of by-product D that need to be processed further at a cost of N$0.50/ unit before they were sold for N$2.50/unit. Green & Co has the option of allocating the net sales of the by-product to the joint cost or to cost of goods sold. Calculate the difference in gross profit between the 2 options. NB: You are not required to enter the unit or currency symbol. Enter numerical answer with no spaces. For example: 1000