Imagine you are four years old. A rich aunt wants to provide for your future. She has
offered to do one of two things.
Option 1: She would give you $1000.50 a year until you are twenty-one.
Option 2: She would give you $1 this year, $2 next year, and so on, doubling the amount
each year until you were 21.

Write an equation to represent each option. Explain your reasoning for choosing the
equation you selected. Describe each variable in your equation.