The materials used by Hibiscus Company Division A are currently purchased from outside supplier at $$55$ per unit. Division B is able to supply Division A with $21,700$ units at a variable cost of $$49$ per unit. The two divisions have recently negotiated a transfer price of $$50$ per unit for the $21,700$ units.

$($a$)$ By how much will each division's income increase as a result of this transfer? Enter an increase as a positive number and a decrease as a negative number.

Division A s

Division B s

$($b$)$ What is the total increase in income for Hibiscus Company?