The numbers of three types of bank accounts on January 1 at the Central Bank and its branches are represented by matrix A.      Checking  accounts      Savings accounts       Fixed-  deposit accounts   Main office   2840           1490            1120   1030           540            480 1170           560            480 A =  Westside branch   Eastside branch The number and types of accounts opened during the first quarter are represented by matrix B, and the number and types of accounts closed during the same period are represented by matrix C. Thus, B =    260 120 110   140 60 50 120 70 50    and    C =    120 80 80   70 30 40 60 20 40. (a) Find matrix D, which represents the number of each type of account at the end of the first quarter at each location. D =

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