Hi, I need manual computations. Thank you!

Question 3 10 points Save Answer A printing press machine has a cash equivalent of P244,835. For the first three years, it will provide P22,994 worth of profit each year. For the next four years, annual profit will be P37,492. For the last two years, expenses will exceed revenues and will have a loss of P8,784 each year. Calculate the ERR if = 15% given that MARR is 18%. Question 9 10 points Save Answer A computer call center is going to replace all of its incandescent lamps with more energy efficient fluorescent lighting fixtures. The total energy savings are estimated to be $1,875 per year, and the cost of purchasing and installing the fluorescent fixtures is $4,900. The study period is five years, and terminal values for the fixtures are negligible. What is the IRR of this investment? Express your answer in percent rounded to two decimal places, Question 10 10 points Save Answer A new air conditioning unit costs P139,625 and will have a salvage value of P12,811 after 5 years. Electrical cost per kWh is P1.25. Calculate the annual savings in terms of electrical savings (in kWh rounded to the nearest whole number) if MARR is 15% per year