7. A store's revenue is the amount of money received for goods sold. A store's cost is the amount of money the store pays for the goods plus all the store's operating costs like rent, utilities, wages , etc. A store's net profit is the difference between revenue and cost. During 1 month, a grocery store paid $30,000 for goods that were sold for $39,500. With operating costs as shown below, what was the store's net profit for that month?