In all the three sections of Woodland High school there are 50,70 and 80 students , those who secured F grade are 10% ,20% ,and

In all the three sections of Woodland High school there are 50,70 and 80 students , those who secured F grade are 10% ,20% ,and 30% respectively.What percentage of the total students in the school secured F grade ?
A. `12.5`
B. `15.6`
C. `21.5`
D. `23.4`

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In all the three sections of Woodland High school there are 50,70 and 80 students , those who secured F grade are 10% ,20% ,and 30% respectively.What

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