Question

Hank finally gets an allowance! He puts $2, away in January, $4, away in February, $8, away in March, $16 away is April and followed this savings pattern through December. How much money does Hank have in 12 months?

Answer 1

a lot ... must be some allowance ...

2 + 4 + 8 + 16 + 32 + 64 + 128 + 256 + 512 + 1024 + 2048 + 4096

2^13 - 2 = 8190

Answer 2

Hank is doubling each month so 2^12 = ?

Answer 3

My 2^12 gives the amount in Dec. You need to add all the months together.