Sets, Relations and Functions: JEE Main 2021 Mathematics question

Let  A = {n $\in$ N: n is a 3-digit number}        B = {9k + 2: k $\in$ N} and C = {9k + $l$: k $\in$ N} for some $l ( 0 < l < 9)$ If the sum of all the elements of the set A $\cap$ (B $\cup$ C) is 274 $\times$ 400, then $l$ is equal to ________.