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Posted by **kennisha** on Monday, July 25, 2011 at 6:24pm.

- math -
**Ms. Sue**, Monday, July 25, 2011 at 6:27pmOne way to solve this problem is simply to keep doubling the numbers.

1 - 15

2 - 30

3 - 60

4 - 120

5 - 240

etc.

Be sure to add your numbers together to find the total orders for the year.

- math -
**kennisha**, Monday, July 25, 2011 at 6:31pmbut would i have to use the geometric series to find this out

- math -
**Reiny**, Monday, July 25, 2011 at 6:31pmlooks like a GS where

a = 15

r = 2

n = 12

S₁₂ = 15(2^12 - 1)/(2-1)

= 61425

- math -
**kennisha**, Monday, July 25, 2011 at 6:32pmok thanks you

- math -
**kennisha**, Monday, July 25, 2011 at 6:54pmbut when i did it i got 30720

- math -
**Ms. Sue**, Monday, July 25, 2011 at 7:41pmIn month 12, there were 30,720 customer's orders.

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