2 part question

On March 28, 2008, Daniela Motor Financing (DMF), offered some securities for sale to the public. Under the terms of the deal, DMF promised to repay the owner of one of these securities $100, 000 on March 28, 2028, but investors would receive nothing until then. Investors paid DMF $24, 299 for each of these securities: so they gave up $24, 299 on March 28, 2008, for the promise of a $100, 000 payment 20 years later. (a) Based on the $24299 price, what rate was DMF paying to borrow money? (b) Suppose that, on March 28, 2018, this security's price is $39, 783. If an investor had purchased it for $24, 299 at the offering and sold it on this day, what annual rate of return would she have earned? (c) If an investor had purchased the security at market on March 28, 2018, and held it until it matured, what annual rate of return would she have earned You can earn 0.50 percent per month at your bank. Required: If you deposit $3, 323, how many months must you wait until your account has grown to $4, 438? (Enter rounded answer as directed, but do not use the rounded numbers in intermediate calculations. Round your answer to 2 decimal places (e.g., 32.16).)