How can I store user's input into 10x4 array until EXIT button is cliked?

Question

I am doing a fairly small project to calculate future value base on monthly amount invested and percent rate and how long.  I want to hold 10 calculatioin in an array with 4 columns to hold 1.monlthyInvestment, 2.interestRate, 3.years, 4.futureValue and display all these in a MessageBox.  can anyone help me please?