This question  was well attempted by majority of the candidates., though a few candidates applied the  wrong formula and some stopped the arithmetic at 1.11A instead of 1.111A.  A Few others failed to subtract the given value from the calculated value  to arrive at the error required of them.  Generally performance was above average .
The expected answer is
Mass deposited, m = zIt
                                  OR
                   I   =                                                                                                                                 
                        =                                                                                               
                         =  1.111A                                                                                                        
                      Error  =   1.111 – 1                                                                                              

                                 =  0.111A