Taplop supplies laptop computers to large businesses. On $1$ July $20$X$5,$ Taplop entered into a contract with TrillCo, under which TrillCo was to purchase laptops at $$500$ per unit. The contract states that if Trillcopurchases more than $500$ laptops in a year, the price per unit is reduced retrospectively to $$450$ per unit.Taplop's year end is $30$ June. $($a$)$ As at $30$ September $20$X$5,$ TrillCo had bought $70$ laptops from Taplop. Taplop therefore estimated that TrillCo's purchases would not exceed $500$ in the year to $30$ June $20$X$6,$ and Trillco wouldtherefore not be entitled to the volume discount. $($b$)$ During the quarter ended $31$ December $20$X$5,$ TrillCo expanded rapidly as a result of a substantial acquisition, and purchased an additional $250$ laptops from Taplop. Taplop then estimated thatTrillCo's purchases would exceed the threshold for the volume discount in the year to $30$ June$20$X$6.$RequiredCalculate the revenue Taplop would recognise in:$($a$)$ Quarter ended $30$ September $20$X$5($b$)$ Quarter ended $31$ December $20$X$5$