The ratio $5: 4$ expressed as a percentage is: (in $\%$)

The price of an article was increased by $r \%$. Later,the new price was decreased by $r \%$. If the latest price was $₹ 1$,then the original price was:

The monthly salary of Mr. Sachdev increases by $5 \%$,and as a result,his new annual salary becomes $₹ 15,120$. What was his earlier monthly salary (before the increase)?

Krishnamurthy earns $₹ 15000$ per month and spends $80 \%$ of it. Due to pay revision,his monthly income has increased by $20 \%$ but due to price rise,he has to spend $20 \%$ more. His new savings are

Aditya's salary was increased by $40 \%$ and then decreased by $25 \%$. Find the net effect on Aditya's salary.

Half of $1$ per cent written as a decimal is