Andrew had $250 in his savings account. he then deposits the same amount of money each week for 6 weeks. he deposits twice that amount each week for another 4 weeks. if d is the amount of money andrew deposits each of the first 6 weeks, which expression represents how much money he has in his account after 10 weeks?
a) 250 + d + 4(2d)
b) 250 - d + 4(2d)
c) 250 + 6d + 4(2d)
d) 250 - 6d + 4(2d)