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kayley is saving money for a vacation she starts out saving 10 dollars a week she plans to double the amount she is saving each month how much money will she be saving the fourth month.

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4 weeks in a month. 

1st month; 10 x 4 = $40
2nd month; 40 x 2 = $ 80 
3rd month; 80 x 2 = $160
4th month; 160 x 2 = $320

40 + 80 + 160 + 320 = $ 600

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