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In an examination of a certain class, at...

In an examination of a certain class, at least 70% of the students failed in Physics, at least 72% failed in Chemistry, at least 80% failed in Mathematics and at least 85% failed in English. How many at least must have failed in all the four subjects?

A

`8%`

B

`7%`

C

`6%`

D

`15%`

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