Total number of sodas that Daniel has to buy for the promotion is 8832 bottles.
According to the question,
Number of customer in Daniel shop doubles every week . It is given that in first week their 4 customers, that is,
1 week = 4 customers
2 week = 4 * 2 = 8 customers
3 week = 8 * 2 = 16 customers
Similarly, 4 week = 32 customers
6 week = 128 customers
8 week = 512 customers
12 week = 8192 customers
In total there will be,
128 + 512 + 8192 = 8832 customers
Hence Daniel has to buy 8832 bottles of soda for the promotion.
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