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The time at which $₹150$ doubles itself at $4\%$ simple interest is $k$ years. Find the value of $k$.

Principal$=₹1000$, rate$=5\% \mathrm{p}.\mathrm{a}$ and time $=3 \mathrm{years}$. If interest is $₹k$, then find the value of $k$

Rekha borrowed a loan from bank. After $3$ years she paid $₹4752$ and settled the accounts. If the rate of interest is $9\%$ per annum, what sum did she borrow?

In what time will $₹100$ become $₹200$ at $10\%$ rate of interest per annum?

Find the interest on $₹2500$ at $5\%$ interest per annum for $5$ years.

Rumni takes a loan of $₹14,000$ on $6\%$ rate of interest per annum for $5$ months. Calculate the simple interest.

In how many years will a sum of money triple itself at $10\%$ interest per annum?

The extra money charged on an amount of money borrowed or lent is called the _____. $\left(\mathrm{Interest} / \mathrm{Discount} / \mathrm{Profit} / \mathrm{Loss}\right)$