$A$ number is decreased by $10 \%$ and then increased by $10 \%$. The number so obtained is $10$ less than the original number. What was the original number?

An agent gets a commission of $2.5 \%$ on the sales of cloth. If on a certain day,he gets Rs. $12.50$ as commission,the cloth sold through him on that day is worth?

On a certain date,Pakistan has a success rate of $60 \%$ against India in all the $ODI$s played between the two countries. They lost the next $30$ $ODI$s in a row to India and their success rate comes down to $30 \%$. The total number of $ODI$s played between the two countries is

The price of sugar has fallen by $10 \%$. How many quintals can be bought for the same money which was sufficient to buy $18$ quintals at the higher price?

$A$ number $x$ is $125 \%$ of $y$. To compute $y$,the number $x$ has to be multiplied by:

Mr. Sarang invests $6 \%$ of his monthly salary,i.e.,$Rs.$ $2,100$ on insurance policies. He also invests $8 \%$ of his monthly salary on Family Mediclaim Policies and another $9 \%$ of his salary on $NSCs$. What is the total annual amount invested by Mr. Sarang?