Question

The number of illiterate persons in a country decreased from 150 lakhs to 100 lakhs in 10 years. What is the percentage of decrease?

Answer 1

Original amount = the number of illiterate persons initially = 150 lakhs.
Amount of change = decrease in the number of illiterate persons = 150 – 100 = 50 lakhs.
Therefore, the percentage of decrease = `"Amount of change"/"Original amount" xx 100`

= `(550)/(150) × 100`

= `33 1/3`.