Roger Sterling has decided to buy an ad agency and is going to finance the purchase with seller financing $-$that $$is$,$ a loan from the current owners of the agency. The loan will be for $ $2,300,000$ financed at an APR of $10$ percent compounded monthly. This loan will be paid off over $4$ years with$$ end$-$of$-$month payments, along with a $ $400,000$ balloon payment at the end of year $4.$ That$$ is$,$ the $ $2\mathrm{.}3$ million loan will be paid off with monthly$$ payments, and there will also be a final payment of $ $400000$ at the end of the final month. How much will the monthly payments$$ be$?$

a$.$ How much of the loan will be paid off by the final $$$$400,000$payment$?$

b$.$ How much of the loan must be paid off by the equal monthly$$ payments?

c$.$ How much will the monthly payments$$ be$?$