A box of 20 items was bought for Rs. 6,400 after a discount of 20%. Find the cost of each item before discount.
C.P after discount = 6400
D = 20%
C.P before discount = $$\frac{100}{80}\times6400=8000\ $$
C.P of each item before discount = $$\frac{8000}{20}=400$$.
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