Question

$\text{The number of illiterate persons in a country decreased from 150 lakhs}\text{to 100 lakhs in 10 years.What is the percentage of decrease?}\text{[3 marks]}$

Answer 1

$\text{Number of illiterate persons initially}=150\text{lakhs}\text{Number of illiterate persons reduced to 100 lakhs}\Rightarrow \text{Decrease}=(150-100)\text{lakhs}=50\text{lakhs}\text{[0.5 mark]}\text{We know that, decrease percentage}=\frac{\text{Decrease}}{\text{Initial}}\times 100\text{[1 mark]}\text{Hence, the decrease percentage:}\Rightarrow \frac{50\text{lakhs}}{150\text{lakhs}}\times 100\%=\frac{100}{3}\%=33.33\%\text{[1.5 marks]}$