Please Calculate using the formulaThanks

The photocopy service of LU (LUPS) intends to replace eventually its old model of paper piercing machine by a new model. Papers are sold to students for 4 cents each and the service sells 4 million pages every year. The old machine was purchased 5 years ago for 8000$, has a 4000$ market value at the present. The new model of this equipment costs 6000$ and could be sold at 2000$4 years (end of project). The supplier of the new model accepts to pay an exchange value equal to the market value for the old model, if LUPS purchases the new model from him. The old equipment costs 1500$/ year for maintenance and repair and the new model would cost only 250$/ year. The new model would also decrease the stock by 800$. The stock is 1200$ at the present time. The papers cost to the LUPS 2 cents each, if they are pierced by the service itself, and 2.05 cents, if they are already pierced by the supplier before delivery. This type of equipment is in the category of CCA at 20% on declining method. The company's tax rate is 35% and the director of operation requires 13% on this type of project. What are the alternatives for LUPS and which one would be more profitable