A trader sells pulses at 10% below cost price, but his scale gives only 800 g when it shows 1 kg. What is his overall result?

Explanation

1. 01

   Cost of what he gives = cost of 800 g.

2. 02

   He collects 90% of the cost of 1,000 g = the cost of 900 g.

3. 03

   Gain = $\frac{900 - 800}{800} \times 100 = 12.5\%$.