Commercial Math Questions

Ten copies of the book can be bought for a certain sum of money payable at the end of $2$ years. $12$ copies of the same book can be bought for the same sum in ready cash. What is the rate of interest per annum?

The ratio of the principal and the amount (principal along with interest) in $1$ year is $8:9$, the rate of simple interest per annum is:

At the same rate of simple interest per annum, if a principal becomes the amount of Rs. $7100$ in $7$ years and of Rs. $6200$ in $4$ years, determine the principal amount.

Sita deposited some money in a bank at the rate of simple interest of $5.25\%$ per annum. After $2$ years, she has got Rs. $840$ as interest. Calculate the money she has deposited into the bank.

If a sum of money doubles itself at a fixed rate of compound interest per annum in $n$ years, find in how many years it will become four times.

If a principal becomes twice of its amount in $10$ years, the rate of simple interest per annum is:

Calculate the principal whose monthly interest is Rs. $1$ having the rate of simple interest of $5\%$ per annum.

A weaver cooperative society takes a loan of Rs. $15,000$ for buying a power loom. After $5$ years, the society has to repay Rs. $22,125$ for recovering the loan. Find the rate of simple interest per annum.

Calculate the number of years for which the interest of Rs. $600$ at the rate of simple interest of $8\%$ per annum will be Rs. $168$.

A sum of money doubles itself in $8$ years at some rate of simple interest. In how many years would it triple itself?

A small business owner took a loan of $\text{Rs. }73000$ from his friend. He repays the principal along with interest, totaling $\text{Rs. }73100$, after $1$ day. The rate of simple interest per annum is

There is $25\%$ profit if an article is sold at Rs. $150$. At what per cent should the selling price be increased so that there will be $30\%$ profit?

A certain sum amounts to Rs. $17,200$ at $12\%$ simple interest per annum in a period in which Rs. $22,080$ amounts to Rs. $37,536$ at $14\%$ simple interest per annum. Find the sum.

Write the number of years in which the amount becomes twice of the principal having the rate of simple interest $6\frac{1}{4}\%$ per annum.

A sum amounts to Rs. $1180$ in $3$ years and to Rs. $1300$ in $5$ years. Find the rate of interest.

If the total interest becomes Rs. $x$ for a principal having the rate of simple interest of $x\%$ per annum for $x$ years then, the principal will be:

A person deposited Rs. $100$ in a bank and got the amount Rs. $121$ for two years, the rate of compound interest per annum is:

A sum of amounts will be doubled in $7\frac{1}{2}$ years. What is the rate per cent?

Find the rate of compound interest per annum, so that the amount on Rs. $400$ for $2$ years becomes Rs. $441$.