Question

Ram adjusted his electronic weighing scale in a typical way. But he gives a discount of $10\%$ in every transaction. His weighting scale shows 5 kg for 4 kg. What is the actual profit $\%$ when the displayed weight is 10 kg, if he sells the commodity at its cost price?

• A. 12.5%
• B. 10%
• C. –5%
• D. 50%
• E. 40%

Answer 1

The correct option is A 12.5%

Let Ram buy 10 kg for Rs 100
Since 4kg shows 5 kg in weighting scale
$\Rightarrow$ when he sells 8 kg weighting scale shows 10kg find he gives $10\%$ discount
So, he sold 8kg for Rs 90 and had bought if for Rs 80
$\Rightarrow$ Profit $\%=\frac{10}{80}\times 100=12.5\%$