It's been estimated that the income generate by some new equipment is $500,000 the first year and that it'll increase by $50,000/year, from the 2nd year up to the 5th. However, it's been estimated that the annual income will begin to decrease from the 6th year by $40,000/yar. The company will conserve the equipment for 12 years. If the interest rate is 18% annual, calculate the present value (t=0) of the cited incomes