If It is simple interest problem, then we can find Total Amount to be repaid after 30 years.
The principal amount is P = $159,000.
Annual Percentage Rate is 6.5%, so R = 0.065
Time of loan repayment is 30 years, so T = 30
We can use Simple Interest formula to find the interest to be paid at maturity of loan.
Interest = Principal x APR x Time
Interest = PRT
Interest = 159000 x 0.065 x 30
Interest = 310,050
Total Amount to repay = Principal + Interest
Total Amount to repay = 159,000 + 310,050
Total Amount to repay = 469,050 dollars.
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If it is monthly payment problem, then we can use Present Value formula to find the monthly payments to be repaid.
We have loan amount, PV = 159000.
r = 0.065; t = 30 years; k = 12 (compounded monthly).

So, monthly payments = $1,004.99
Total amount paid over loan period = 1004.99 x 360 = $361,795.74
Total interest paid over the loan period = $202,795.74