Your boss wants you to take his guests for a city tour at the cost of your missing an important sales yet he doesn't agree upon your low sales?Suggest

A very common practice in most of the organization setup. You are expected to do certain tasks over and above your responsibilities without impacting your own performance. There can be two solutions: Solution A is to put extra hours of effort to compensate the sales deficit within the same sales period/month. Solution B could be to start next month on a high and to over achieve sales target next month. The two solutions mentioned above are ideal however, Solution B is more practical, you can talk to your boss assertively explaining about the situation and then putting up the BACKUP plan.