By What Amount,if Any,would Each of the Following Errors Cause

Essay

By what amount,if any,would each of the following errors cause a trial balance to be out of balance?
a.A purchase of supplies of $840 was recorded as a debit to Equipment and a credit to Cash for $840.
b.An $890 balance in Prepaid Insurance was copied to the trial balance as a debit of $980.
c.A $600 balance in Accounts Payable was copied to the trial balance as a debit of $600.