Pat Radigan is planning to buy a Toyota hybrid for $$18,839$ with $$1,400$ down and plans to finance the car. Citizens$$ Financial Bank quoted a finance charge at $8\mathrm{.}5\%$ for $48$ months; Charter One Bank quoted him a finance charge at $8\%$ for $60$ months.

a$.$ What would be his monthly payment to Citizens$$ Financial Bank? $($Do not round intermediate calculations. Round your answer to the nearest cent.$)$

b$.$ What would be his monthly payment to Charter One Bank? $($Do not round intermediate calculations. Round your answer to the nearest cent. $)$

c$.$ How much more would his monthly payment be on the $48-$month loan? $($Do not round intermediate calculations. Round your answer to the nearest cent.$)$