A 20 m chain after measuring a distanceof 4000 m was found to be 10 cm more than the designated length. If the chain was Standardized before the commencement of survey then the length is
A4020 m
B3990 m
C3980 m
D4010 m
A4020 m
B3990 m
C3980 m
D4010 m
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