Discussion

Explanation:

1 kg = 1000 gm

Used weight = 800 gm 

Error = 200 gm

% profit = (200/800×100) = 25%

Alternately,

Let the CP = SP = Rs. 1/gm

He buys 800 gms and while selling quotes it as 1000 gms.

Total cost price = 800 × 1 = Rs. 800

Total selling price = 1000 × 1 = Rs. 1000

∴ Profit % = (1000 - 800)/800 × 100 = 25%

Hence, option (b).

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