Question:A dishonest dealer professions to sell his goods at cost price. But his uses a 900 gm weight for a kilogram. His gain percent is : 

A 953 gms 
B 940 gms 
C 960 gms 
D 947 gms 

+ Answer
B 

+ Explanation
Let error = x gms
Then, `x/(1000-x) xx 100` = ` 6 (18)/47`

or, `100x/(1000-x) ` = `300/47`
or, `47 xx x` = ` 3(1000 - x)`
or, ` 50xx x` =3000
or, x = 60
`:.` weight used =`(1000- 60)
   =940 gms

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Muhammad Abdullah Al Mamun

Editor, VCampus

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