I hope your successful in your work with bananas because bananas are one of my favorite fruits.
Double a penny for 28 days (4 weeks x 7 days) = $1,342,177.28
We'll call it a $million dollars for simplicity.
If you do it for 30 days you get $5,368,709.12
If you do it for 31 days you get $10,737,418.24
You only have one penny on the first day.