Finance hw here, help is needed than u !!

3. A new car can be purchased by paying cash $40,000 now, or by the term offered by dealer as 60 equal monthly payment of $752 each month. What monthly interest rate implied by the dealer offer? A. 0.4% B. 0.8% C. 1.2% D. none of the above; the correct answer is 4. You want to put some money for your child's college education. College will cost $100,000 after 20 years. You can earn 12% annual interest rate, how much do you need to invest today? A. $10,366 B. $44,642 C. $56,742 D. None of the above; the correct answer is 5. How long would it take for you to save an adequate amount for retirement if you deposit $15,000 per year into an account at the end of each year that pays 10% interest rate per year if you wish to have a total of $1,500,000 at retirement? A. 10 years B. 20 years C. 25 years D. None of the above; the correct answer is