John, has worked as a cleaner for $6$ years at an Ontario supermarket $($that has never closed all or part of its business$),$ has been fired because employer feels that there are too many part$-$time employees. What does the employer owe John on dismissal in the following two different circumstances? Make sure to provide details and to explain both of your answers. Each part of this question is worth $3$ marks, for a total value for this question of $6$ marks.

$($a$)$ John's employment contract has a clear term stating that he is to be given everything required under the Employment Standards Act upon termination. We do not know the employer's payroll.

$($b$)$ John's employment contract states that he is to be given $7$ weeks notice upon termination. The employer has a payroll of $$3$ million.