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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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