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

The monthly income of a person is $Rs. 5000$. If his income is increased by $30\%$,then what is his monthly income now?

$A, B$,and $C$ invested in a business in the ratio of $3:2:5$ respectively. If $A$ earns $100\%$ more profit than $B$ and $C$ earns $40\%$ more profit than $B$,then what is the share of $B$ in the profit?

$15 \%$ of $578 + 22.5 \%$ of $644 = ?$

The value of a machine depreciates at the rate of $10 \%$ every year. It was purchased $3$ years ago. If its present value is $₹ 8748$,what was its purchase price?

$6 \frac{2}{3} \%$ expressed as a fraction in its lowest term is: