What will the loan balance be at the end of year $5$ under parts a $(1)$ through a $(4)?$

Note: Do not round intermediate calculations. Round your final answers to the nearest whole dollar.

b$1.$ Loan balance if loan is fully amortizing $$72,239$

b$2.$ Loan balance if loan is partially amortizing $$77,947$

b$3.$ Loan balance if loan is non$-$amortizing $$100,000$

b$4.$ Loan balance if loan is negatively amortizing $$126,042$