Three basic concepts underlie the time value of money are Inflation, Risk, and Preference. Opportunity cost rate is the rate of an alternative investment that you could invest in.

Class, let's say that somebody takes out a car loan. The loan is for $20,000, monthly payments are made for five years, and the annual interest rate is 1.8%. What will the monthly payment be? You can use the excel sheets in My Class Notes.

Also, explain how I could double my money in one year.

Remember to always share your references and use your own words.