If total revenue is 3000, cost of goods is $1500, and a total selling expensesis $500; what is the profit for business?

This sounds like simple addition & subtraction.

Total revenue = $3,000

Cost of goods = $1,500

Total expenses = $500

Profit = x

x = 3,000 - 1,500 + 500

x = 3,000 - 2000

x = 1,000

Profit for the business is $1,000