a penny doubled every day for 365 days

[Arthas]

If I had a penny doubled every day for 365 days, how many pennies would I end up with?

[eliphas0]

1c X 2 X 365 = 730 pennies or $7.30

[corby]

unless maybe you mean its doubling every day?

Like first day you have 1c
2nd day you have 2c
3: 4c
4: 8c
5: 16c
6: 32c
7: 64c
8: 128c ($1.28)

Anyway the formula I think is 2^(n-1) where n is the number of days. after 30 days you gonna have over 5 million dollars actually and after 1 year you gonna have some astronomical amount