Problem 1 - Square a number

Write a VBA program to store a value in a variable, calculate the square of that value, and return the results.

Problem 2 - Future Value

Given that:

F= P(1+ i)n

Where:

F= future value

P= present value

I= interest rate PER MONTH

n= number of months

Write a program to calculate a future value, given the present value, interest rate per month, and

number of months.

Problem 3 - Future Value with error correction

Given the formulas and variables described in Problem 2, enhance your future value program by making sure that none of the information entered by the user (present value, interest rate, or number of months) is a negative number.