21 In a special offer 5 pens can be bought at the price of 3
pens. If 5 pens were bought at special offer, the amount
saved will be what percent of original price of 5 pens?
А)
20%
B)
30%
C)
40%
D)
50%
60%
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Answer:
let, the value of each pen is x
5 pens _ 5x
3 pens _ 3x
according to the discount,
5 pens' price _ 3 pens' price
gain _ 5x - 3x _ 2x
hence, percentage _ 2x/5x*100
_40(C)
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