day 1: $0.01 day 2: $0.02 day 3: $0.04 day 4: $0.08 day 5: $0.16 day 6: $0.32 day 7: $0.64 day 8: $1.28 day 9: $2.56 day 10: $5.12 day 11: $10.24 day 12: $20.48 day 13: $40.96 day 14: $81.92 day 15: $163.84 day 16: $327.68 day 17: $655.36 day 18: $1,310.72 day 19: $2,621.44 day 20: $5,242.88 day 21: $10,485.76 day 22: $20,971.52 day 23: $41,943.04 day 24: $83,886.08 day 25: $167,772.16 day 26: $335,544.32 day 27: $671,088.64 day 28: $1,342,177.28 day 29: $2,684,354.56 day 30: $5,368,709.12 day 31: $10,737,418.23
A penny doubled each day for a month:
day 1: $0.01 day 2: $0.02 day 3: $0.04 day 4: $0.08 day 5: $0.16 day 6: $0.32 day 7: $0.64 day 8: $1.28 day 9: $2.56 day 10: $5.12 day 11: $10.24 day 12: $20.48 day 13: $40.96 day 14: $81.92 day 15: $163.84 day 16: $327.68 day 17: $655.36 day 18: $1,310.72 day 19: $2,621.44 day 20: $5,242.88 day 21: $10,485.76 day 22: $20,971.52 day 23: $41,943.04 day 24: $83,886.08 day 25: $167,772.16 day 26: $335,544.32 day 27: $671,088.64 day 28: $1,342,177.28 day 29: $2,684,354.56 day 30: $5,368,709.12 day 31: $10,737,418.23