I need only answers within one and half hours.

(1) "Consider two mutually exclusive projects that will be conducted for a total of 6 years. Project A lasts 3 years (so it will need to be repeated 1 time) and has the following cash flow:

Year 0 -$29,000;

Year 1 $19,000;

Year 2 $18,000;

Year 3 $13,000.

Project B lasts 2 years (so it will need to be repeated 2 times) and has the following cash flow:

Year 0 -$27,000;

Year 1 $18,000;

Year 2 $21,000.

Assume both projects can be repeated with the identical cash flows. The interest rate is 14%. Provide the net present worth for 6 YEARS of the project that you should select. If neither project should be selected, enter 0."

(2) "A building owner is considering installing solar roof panels on a building. The cost of installing solar panels is $16,000 + $22.20*S where S is the square footage of the solar panels. There is an annual maintenance cost of $4.10 per square foot of installed solar panel. The solar panels will last 16 years, and there is no salvage value or disposal cost. The electricity usage for a single hour for the building with operating solar solar panels is

E = 1000/S

where E is the electricity usage in kWh (kilowatt-hour) and S is the square footage of the solar panels. The cost of electricity is $0.31 per kWh, and the solar panels will operate for 14 hours per day, 365 days per year. The building owner's MARR is 13.8%. Assuming the building owner wants to minimize the annual equivalent cost, how many square feet of solar panels should be installed?

HINT: You should convert the cost of installing the solar panel to an annual cost."

(3) "An aircraft control actuator is part of the flight control system that enables an airplane to fly. It is important that the actuators are reliable. Reliability can be defined as the probability a system is functioning, so it is a number between 0 and 1. One way to increase reliability of the actuator is to increase the torque. The reliability R as a function of the maximum torque T (in Newton-meters) is given by

R(T)=0.91*exp(0.027T)

where torque T is between 0.1 and 3.5. The development and installation cost as a function of reliability equals [$1800+ $11777*(In R)], which will be paid immediately. Maintenance on the actuator will occur in year 3 and in year 8. In each year the maintenance cost as a function of reliability R is [$1210/ln(1.45R)]. Assume the interest rate is 15%.

What is the optimal torque design (a number between 0.1 and 3.5 rounded to the nearest tenth) of the actuator that minimizes the discounted lifecycle costs of the actuator? (You do not need to calculate annual equivalent cost, but you do need to calculate the present value of the costs.)"