A leprechaun places a magic penny under agirl's pillow. The next night there are 2 magic pennies under her pillow. The following morning she finds four pennies.Apparently, while she sleeps each penny turns into two magic pennies. The total number of pennies seen under the pillow each day is the grandtotal; thatis, the pennies from each of the previous days are not being stored away until more pennies magically appear. How many days would elapse before she has a total of more than $21 billion? (Proceed by trial anderror.)