Applying Kirchhoff's Laws to the electrical network in the figure, the currents I1, I2, and I3 are the solution of the system 
Find the currents. 
Definitions:
Gross Margin
The financial metric representing the difference between sales revenue and the cost of goods sold (COGS), expressed as a percentage of sales revenue.
Cost of Goods Manufactured
Refers to the total production cost incurred by a company to manufacture products in a given period, including raw materials, labor, and overhead costs.
Sales
Sales refer to the total revenue earned from goods or services sold by a company during a specific period.
Variable Cost
Costs that vary directly with the level of production or service delivery, such as raw materials and direct labor.
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