28. Gateway Tours is choosing between two bus models. One is more expensive to purchase and maintain, but lasts much longer than the other. Its discount rate is 11%. It plans to continue with one of the two models for the foreseeable future; which one should it choose? Based on the costs of each model shown below, which should it choose? Model Old Reliable Short and Sweet 0 -200 -100 1 -4 -2 2 -4 -2 3 -4 -2 4 -4 -2 5 -4 6 -4 7 -4