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In 1990 Murimi harvested 42 bags of maize from his farm. In 1991 he harvested 8 bags less than in 1990. If in 1990 each bag was sold at sh 360 and in 1991 each bag was sold at sh 480, how much more money did he get in 1991 than in 1990?
A. Sh 7920
B. Sh 5040
C. Sh 11280
D. Sh 1200