Answer:
Antoinette's parents paid $ 70000 by the time she left the school.
Explanation:
Antoinette's parents paid at the beginning (
) $ 6230, and each year paid annual fees including increases seven times. (
) We find that annual fee paid at a given year is represented by the following formula:

Where:
- Initial annual fees, measured in US dollars.
- Current annual fees, measured in US dollars.
- Yearly increase rate, dimensionless.
If we know that
and
, first 8 annual fees paid by Antoinette's parents are:








Now, we sum each yearly fees to determine the total paid by Antoinette's parents when she leaves the school at the end of the 8th year.



Antoinette's parents paid $ 70000 by the time she left the school.