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

Correct option is D

Given:

Initial number of illiterate persons = 150  lakhs,
Final number of illiterate persons = 100  lakhs.
Formula Used:
The percentage decrease is calculated as:
Percentage decrease  = $$\frac{\text{Initial value} - \text{Final value}}{\text{Initial value}} \times 100$$​​
Solution:
Percentage decrease =  $$\frac{150 - 100}{150} \times 100$$​​
Percentage decrease = $$\frac{50}{150} \times 100 = \frac{1}{3} \times 100 = 33\frac{1}{3}\%= 33.33\%$$​​
Thus, the percentage decrease in the number of illiterate persons is 33.33%.