A pre tensioned beam is prestressed with the cube strength of concrete at transfer is 30n/mm2 (β = 0.0235) calculate the transmission length?

A pre tensioned beam is prestressed with the cube strength of concrete at transfer is 30n/mm2 (β = 0.0235) calculate the transmission length? Correct Answer 485mm

β = 0.0235, cube strength of concrete is 30n/mm2, Transmission length (Lt) = ((fcu)1/2 x 103/β)1/2 = ((30)1/2 x 103/0.0235) = 485mm.
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