In order to determine the money that Sharel added to her account, you take into account that each depossit is of $138. So, to know how much money there are for several deposits, it is only necessary to made a multiplication, just as follow:
money = (value of each deposit) x (number of deposits)
value of each deposit = 138
number of depositis = 8
by replacing the previous values you obtain:
money = (138) x (8) = 1,104
Hence, Sharel added $1,104 to her account while the 8 deposists