CAN YOU PLEASE EXPLAIN HOW YOU GOT THE ANSWER AND WHAT MATH YOU DID? I'M USING A BA II PLUS CALCULATOR TO TRY SOLVING THESE PROBLEMS. THANK YOU!

You can afford a $1,600 monthly payment for a 6% fixed rate 30 year fully amortizing loan to buy a home with an 80% LTV, the most you can afford to pay for a house (assuming you have the down payment) is:

A) $26,667

B) $266,867

C) $333,583

D) $22,024

SECOND QUESTION:

You are buying an organic food co-op on Williamson St. for 5,000,000, you know the cap rate is 8.5% and you can expect the NOI to grow by 3% per year. At the end of the third year, you plan to sell the co-op for $5,009,806. Whats the NPV of this investment considering a 7% Discount rate?

THIRD QUESTION:

You have recently taken out a $500,000 loan with an amortization period of 30 years, at 8% interest that compounds monthly. After 15 years how much interest have you paid?

FOURTH AND LAST QUESTION FOR THE SET:

You enter into an agreement to buy a building in 1 year for $1,000,000. As part of this agreement you can put down a payment now (year 0), and pay the remainder in year 1. You decide to pay $600,000 now. Assuming a discount rate of 6%, how much in todays dollars do you still have to pay?