Please help me solve part a and b showing all steps and replacing the formulas letters with numbers so I don't get confuse. Please.

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Will has a $35-$year mortgage on a $$140,000$ loan for his house in Florida. The interest rate on the loan is $3\mathrm{.}6\%$ per year $($nominal interest$),$ payable monthly at $0\mathrm{.}3\%$ per month.

a$.$ What is Will's monthly payment?

b$.$ If Will doubles his payment from Part $($a$),$ when will the loan be completely repaid?

a$.$ The monthly payment is $$587.($Round to the nearest dollar$\_)$

b$.$ If Will doubles the monthly payment, he will repay the loan in months. $($Round to the nearest whole number.$)$