Question

A dishonest shopkeeper claims to sell his goods at cost price, but uses a weight of 800 gm in place of the standard 1 kg weight. What is his gain per cent ?

• A. 25%
• B. 20%
  
• C. 15%
• D. None of the above

Answer 1

The correct option is A 25%

Let the C.P. = Rs.100 per kg, =Rs.100 per 1000 gm=Rs.1 per 10 gm
The shopkeeper uses 800 gm weight as a 1 kg weight so his gain = Cost of 200 gm = Rs.20
$\therefore$ His gain% = $\frac{20}{80}\times 100=25\%$