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A company employs 20 grade I, 100 grade II and 200 grade III workers . each grade I worker earns sh 2400 per month and each grade III worker earns sh 1200 per month. The company spends sh 468 000 per month for paying all the workers. How much does a grade II worker earn per month?
A. 4680
B. 1800
C. 1463
D. 180000