A person's whose salary was ₹10,00,000 per annum, received annual increments for three years. The person's salary is now, ₹15,84,000 per annum. The percentage rate increment received in the first two years were the same, and it was different in the 3rd year.

What was the percenatge rate increment received in the 3rd year?

The price of flight tickets of for a specific route offered by airline was $₹10,000$. The airline increased the price of tickets by $r\%$ due to a high of demand. However, the company decreased the price by $r\%$ a weeks later. 

What is the final price of the tickets?

An amount of ₹1,000 was deposited for 10 years, at 12% interest rate per annum, compounding quarterly. Which of these graphs shows the growth of amount?

A fruit shop promoting the sales of apples, offers 1 apple free for every 9 apple purchased. Amit purchased a bag of 10 apples in which 1 apple was free. Arun purchased two bags of 10 apples each, and with each bag he got one apple free.

What is the percentage of discount received by Amit and Arun respectively.?

A person spends 50% of his income. In next year, the income increased by 10% and expenditure increased by 20%. What is the percentage increase/decrease in the savings?

A town with a population of $10,000$ people saw migration of people of from the nearby towns at very high, but at a constant rate each year. As per the census made by the authorities, $2400$ people migrated between the end of $1$st  year and the end $2$nd year.

Find the percentage rate of increase of population in the town per year.

A retailer bought $540$ coconuts and recovered his entire cost by selling $400$ of them. If the retailer procured $₹20$ per coconut, what is price at which he sold each coconut in rupees?

In a class, $60\%$ of the students are girls. Of the girls $25\%$ of them took Mathematics as their core subject of study, which is $50\%$ more than the number of girls who opted for Mathematics in the previous year. There were 4 girls opted for Mathematics as the core subject in the previous year.

How many students are there in the present class?