Harriet Marcus is concerned about the financing of a home. She saw a small cottage that sells for $$64,000.$ Assuming that$$she puts $20\%$ down, what will be her monthly payment and the total cost of interest over the cost of the loan for each assumption? $($Use the$$Table $15\mathrm{.}1)$Note: Do not round intermediate calculations. Round your answers to the nearest cent.e$.$ What is the savings in interest cost between $6\mathrm{.}50\%$ and $7\mathrm{.}50\%?$Note: Round your answer to the nearest dollar amount.Interest Cost:$$f Harriet uses $30$ years instead of $25$ for both $6\mathrm{.}50\%$ and $7\mathrm{.}50\%,$ what is the difference in interest?Note: Use $360$ days a year. Round your answer to the nearest dollar amount.$$Interest Difference: