Concrete Technology and Design of Concrete Structures
If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

depends on as, only
depends on both crst and acbc
is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.
depends on aCbC only

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Concrete Technology and Design of Concrete Structures
According to IS : 456-1978, the fiexural strength of concrete is

directly proportional to compressive strength
inversely proportional to compressive strength
directly proportional to square root of compressive strength
inversely proportional to square root of compressive strength

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