a. Calculate the after-tax cost of borrowing from the motorcycle dealership. b. Calculate the after-tax cost of borrowing through a second mortgage on Bella's home. c. Which source of borrowing is less costly for Bella? d. Should Bella consider any other factors when deciding which loan to take out? a. The after-tax cost of borrowing from the motorcycle dealership is ; ;. (Round to the nearest whole percentage.) b. The after-tax cost of borrowing through a second mortgage is %. (Round to two decimal places.) c. Which source of borrowing is less costly for Bella? (Select the best answer below.) A. Both loans have the same rate of 24%, so Bella should choose the loan she likes best. B. Both loans have the same rate of 24%, so Bella should not take either loan. C. Bella should borrow by taking the second mortgage. D. Bella should borrow by taking the dealership loan