Data
Option 1
• $1000.50 per year until you are 21.
Option 2
• $1 this year, $2 next year, and so on, doubling the amount until 21.
Procedure
• Option 1
• Option 2
Based on these equations, we would need to know the year that she would start giving us money and if the account had some money previously, as it would be added as a constant.
For example, if we had already $800, then we would have to add as follows:
Answer: we would have to know if the account had some money previously.