Net Profit is the money left over from sales after expenses have been accounted for.First, we need to calculate the Gross Profit. This is Sales - Cost of Sales, so (85000 -15000). Our Gross Profit is £70 000. Next, we move on to calculating the total expenses of the period. Rent + Advertising Expenses are all the given expenses, so (5000 + 7000). The expenses are £12 000. Finally, Net Profit = Gross Profit - Expenses. Therefore, our Net Profit is £70 000 - £12 000 = £58 000.