What was the percentage increase in the monthly income of Jyoti in the year 2008 as compared to previous year ?

Answer: Option A

Jyoti's income in 2008 = Rs. 27000
Jyoti's income in 2007 = Rs. 18000
∴ Increase percentage
$$\begin{array}{rl}& =\frac{2700-1800}{18000}\times 100\\ & =\frac{9000}{18000}\times 100\\ & =50\%\end{array}$$