In a class of $80$ students,each student got sweets that are $15 \%$ of the total number of students. How many sweets were there?

$1$ quintal $25$ $kg$ is what percent of $1$ metric tonne?

$A$ 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...

Six-elevenths of a number is equal to $22 \%$ of a second number. The second number is equal to one-fourth of a third number. The value of the third number is $2400$. What is $45 \%$ of the first number?

Anil's monthly income is $30 \%$ more than Ashok's. Ashok's monthly income is $10 \%$ less than Manoj's. If the difference between the monthly income of Anil and Manoj is $₹ 1360$,what is the monthly income of Ashok?

$A$ man's annual income has increased by ₹ $5$ lakhs,but the tax on income that he has to pay has reduced from $12 \%$ to $10 \%$. He now pays ₹ $10,000$ more income tax. What is his initial income (in ₹ lakhs)?