What is the effective rate on a one$-$year $$10,000$ loan at $8\mathrm{.}4\%$ annual interest, compounded monthly?

What is the APR on a one$-$year $$10,000$ loan at $8\mathrm{.}4\%$ annual interest, compounded monthly, if upfront fees on the loan are $$0?$

What is the APR on a one$-$year $$10,000$ loan at $8\mathrm{.}4\%$ annual interest, compounded monthly, if upfront fees on the loan are $$100?$