create spreadsheet that will have two functions:

• Allow a user to input a regular payment, an interest rate and a period of investment, and will output the future value, the total interest earned, the monthly contribution and the average interest earned per year
• Allow a user to input a desired future value, an interest rate and a period of investment, and will output the amount of regular contribution you would need to make, as well as total interest earned, the monthly contribution and the interest earned per year.

The chart will end up looking like this: