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

$A$ district has $64000$ inhabitants. If the population increases at the rate of $2 \frac{1}{2} \%$ per annum,then the number of inhabitants at the end of $3$ years will be...

Dinesh's monthly income is four times Suresh's monthly income. Suresh's monthly income is $20\%$ more than Jyoti's monthly income. Jyoti's monthly income is $₹ 22,000$. What is Dinesh's monthly income?

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

The difference of two numbers is $20 \%$ of the larger number. If the smaller number is $20$,then the larger number is:

If the numerator of a fraction is increased by $150 \%$ and the denominator of the fraction is increased by $300 \%$,the resultant fraction is $\frac{5}{18}$. What is the original fraction?