The answer would be C).
Stmt I)
December = Nov +x
= Oct +2x so on...
= Mar + 9x
Mar + 9x=31000 (1)
2 UNKNOWNS 1 EQN INSUFF
Stmt II
sep = june+30000
mar+6x = mar+3x+30000
Solve for x
Still dont know Feb's revenue so that we can calculate feb+x to be MAR
INSUFF
Combine I and II
Substitute x's value found in stmt II in Mar + 9x=31000 to get Mar rev
SUFF
C)
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