show the formula used to calculate it

Problem 3: How many years will it take for an intial investment of $2000, earning 5.4% annually, to reach $10,000? Problem 4: You have future plans to buy a house 5 years from now. You estimate that a down payment of $20,000 will be required at that time. To accumulate that amount, you want to start making monthly payments into an account paying 3.9% interest. What will your monthly (Rate) Cao & (Compute) ? 390% 12 payments be? (Rate) Crn CPT (Compute) ? 5 3.90% 0 20,000 12 Problem 5: You are buying a car. The one you have choosen to purchase is going to cost you $32,985. Your car salesman has told you that you can purchase this vehicle for $525 per month for 72 months. What interest rate will pu be paying? Problem 6: You are not quite sure about the car deal in Problem 5. So the car salesman now tells you that the company is offering a bonus if you buy the car today. You can either choose to geta $2500discount on the car price, or zero percent financing. Which option is the best deal? Please compute the PMT for both options to find out. (Rate) CPT (Compute) ? 72 32,985 525 (Rate) FY G ths vsf// of s:' the Fooci PV Cao CPT (Compute) ?