Jerry knows that Lucy has coveted his classic car for quite some time. Finally willing to sell it, he sends a letter to Lucy offering to sell the car for $15,000. Lucy responds by saying she needs time to arrange financing. Lucy offers Jerry $100 to keep the offer open for two weeks. Jerry agrees, taking the $100. Three days later, Roberta contacts Jerry saying she is interested in buying the car and has the cash to buy it outright. Jerry is concerned that if he doesn't sell the car to Roberta now, she may not be interested later. Furthermore, Lucy may never be able to arrange financing. Jerry is afraid he may end up with no buyer at all. He comes to you for advice. What do you advise