Ram can count $100$ notes of $₹100$ in $1$ min. Counting machine can do it in $20 \mathrm{s}$. If they work together, they will count $100$ notes in

Hasan rows $36 \mathrm{km}$ with the stream in $6 \mathrm{h}$ and $40 \mathrm{km}$ against the stream in $8 \mathrm{h}$. Speed of boat in still water is

What percent of an hour is $2 \min$?

A man's salary is increased by $10\%$. In order to have his salary back to the original amount, it must be reduced by $x\%$, then value of $x$ is 

The salaries of Rohan and Raj together amount to $₹3500$, if they spend $60\%$ and $80\%$ of their respective salary and ratio of their savings is $1:3$, then their respective salaries should be

By selling a cooler for $₹630$, a man gains $5\%$, at what price he must sell it to gain $20\%$?

The compound interest on a sum of $₹6000$ at $16\%$ per annum for $9$ months when interest is compounded quarterly is

A sum of $₹8000$, invested at compound interest doubles in $5$ years. After $20$ years, it becomes