Elongation of pipe steel A106B

Dear All,

My AI have questioned at elongation values of the test specimens.
Follow photo, why is not 22%, instead of 19.73% and where to find “C” value in this formula.

Thanks in advantages.

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@Adden.Mod
This formula follows API 5L 46th, subsection 9.3 and table 6, table 7.
Re-check your MTC again?

Where:
API 5L: AxC is cross section areas
ASTM A106: A is cross section areas.

19.73% stated in MTC is correct, see note c in table 6 & 7 of API 5L 46th.

So, both the code using the same formula to calculation of elongation.

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As per API 5L

ASTM 106

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Many thanks @Anthony.Tan