A leprechaun places a magic penny under a girl's pillow. The next night there are 2 magic pennies under her pillow. Each night the number of magic pennies doubles. How much money will the girl have after 23 nights?
The total number of pennies will be: 1 + 2 + 4 + 8........and so on. Or: (2^23) - 1 =8,388,608 - 1 =8,388, 607 pennies.
8,388,607 / 100 pennies =$83,886.07 - Total amount of money after 23 nights.
+20 
