If the export revenue from Mainframe increased by 121% in 2000 over that in 1999, what percentage of the export revenue in 1999 was accounted by Mainframe?
Options:
A .  
6.33%
B .  
18%
C .  
14%
D .  
21%
Answer: Option C : C
The required percentage is (14%×132152.21×5981)×100%≈14%.
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