Andrew had $250 in his savings account. he deposited the same amount of money for each of the next 6 weeks. for the next 4 weeks, he deposited twice the money as the previous 6 weeks. if d is the amount of money andrew deposited each week, which expression represents how much money he have in his account after the tenth week?
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a - 250+d+4(2d)
b - 250-d+4(2d)
c - 250+6d+4(2d)
d - 250-6d+4(2d)