Step 4: Let 140:) be the amount of money at the end of your time period if you sell your item after t years. Find A(t) and simplify. What is the domain ofA(t)? Step 5: Graph A(t). Based on the graph, when do you think would be the best time to sell your item? How much money do you think you will have? Step 6: Use calculus to maximize A(t). Check your answer with your guesses in Step 5. Will you have enough money to do what you wanted it for in Step 2 (assuming 2020 prices, of course, not a reasonable assumption)