In Q. 3 Provided that the following equation is true: Gross Profit = Revenue – Cogs. Then how come in answer we use + sign? isn't it has to be sum(revenue) - sum(cogs) rather than correct answer calculates based on sum(revenue) + sum(cogs). Please explain this it is confusing.

Hi Drashti, Good to hear from you. The reason we use a + sign is that Cogs are already negative. Best, Ned

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