// how compiler errors look - note both AccountTest2 and Account

carver% javac AccountTest2.java
AccountTest2.java:32: Incompatible type for =. Can't convert void to double.
    interest = george.monthactivity();
             ^
./Account.java:60: 'return' with value from void monthactivity().
    return interest;
    ^
2 errors

// correct compile

carver% javac AccountTest2.java

carver% java AccountTest2
George's Bank Account       Balance    Ringo's Bank Account        Balance
Initial balance is          $5,000.00      Initial balance is       $10,000.00
Deposits $1500.             $6,500.00
                                           Deposits $823.           $10,823.00
Attempt to withdraw $523.   $5,977.00
After one month, interest      $19.92                                   $36.08
End of the month            $5,996.92                               $10,859.08