A Singly reinforced RCC section has overall dimensions $250mm650mm\mathrm{.}4$ nos of $20$ mm dia Fe $415$ bars are provided at an effective depth of $600$ mm $.$ M$20$ concrete is used. Find $($A$)$ Transformed second moment of area and Cracking moment $($WSM$)$; $($B$)$ Stresses due to applied moment of $90$ kNm $($WSM$)$; $($C$)$ Neutral axis depth $($WSM$).$