If a shopkeeper sells an item at Rs 4200 which is marked as

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79

M: +2.00/-0.50

If a shopkeeper sells an item at Rs 4200 which is marked as Rs 4800, then what is the discount (in %) that he is offering?

[2017 SSC CGL 17 AUG Shift-2]

A 12.5

B 14.28

C 10

D 15