Jameela's salary was 20000 rupees last month and 21000
rupees this month. By percent has the salary increased?

dear student,

increase in percentage is given by = $\frac{difference in amount }{original amount }\times 100$

original salary is given = 20000 Rs
new salary = 21000 Rs 

difference in salary = 1000 Rs

percentage increase in salary = $$\begin{gathered} \frac{1000}{20000}\times 100 \\ 5\% \end{gathered}$$

regards