$($a$)$ Calculate the total contribution margin and the total registration fee income for theseminar.$($b$)$ Calculate the contribution margin ratio.$(12$ marks$)(6$ marks$)($c$)$ Calculate the breakeven point in number of participants$(8$ marks$)($d$)$Calculate the extra profit arising from admitting a further $50$ participants.$(10$ marks$)($e$)$Pioneer Training would like to earn a profit of $$100,000$ instead and the caterer has agreed to allow a $$20$ cut on the cost of food and beverage per participant. Calculate the number of participants required if the registration fee income per participant remain the same.$(14$ marks