A mortgage company offers to lend you $200,000; The loan calls for payments of $ 4,783 per month payments for 20 years and an additional balloon payment of $10,000 at the end of 20th year.

a)What is the Effective annual rate of interest on the loan? b)What is the balance after 5 years on the previous loan? c)Sales for this company doubled in 15 years, calculate the annual growth rate of this companys sales.