David wants to buy a machine for his firm. He expects to incur the maintenance cost of $500 at the end of the 1st year and this rate is going to increase by 10% per year. David expects to make $600 from the machine in the 1st year. This rate is going to increase by 20% per year. At the end of the 10th year, he is going to sell the machine with price of $1000. The required return on investment in this machine for David is 30%. What is the maximum price that David accepts today for this machine? Show your work clearly.