Simple Interest

The time period after which interest is added each time to form a new principal is called _____.

A sum amounts to $₹3600$ at $2\%$ per annum under simple interest and $₹4800$ at $4\%$ per annum under simple interest. The time taken is _____. 

A certain sum is divided into two parts. Th first is lent at $10\frac{1}{2}\%$ per annum for $3$ years and $4$ months and the second at $8\frac{1}{2}\%$ per annum for $2$ years $6$ months/ Prove that $120$ times of the total is equal to the sum $42$ times of the first part and $25$ times the second part.   

Sushma deposited $₹6500$ which amounted to $₹7800$ in $4$ years at simple interest. Had the interest been $2\%$ more per annum, how much would she have received?

A certain sum amounts to $₹4500$ in $2\frac{1}{2}$ years at $20\%$ per annum simple interest. FInd the sum in ₹.

Alok borrowed a certain sum on $9 \text{July} 2006$ and paid an amount of $₹438$ which included interest of $₹6$ on $8 \text{November} 2006$. Find the rate of interest, charged to Alok per annum.

Find the simple interest on $₹700$ from $20 dec 2006 to 20 june 2007$ at $6\%$ per annum in $₹$. 

A sum of $₹3000$ is partly lent at $3\%$ per annum simple interest for $\frac{7}{2}$ years and partly at $2\%$ per annum simple interest for $4$ years. If total interest earned is $₹280$, then the sum lent at $3\%$ per annum is _____.

If $₹300$ is the interest paid on a certain sum at the rate of $5\%$ per annum simple interest for a period of $5$ years, then find the sum in rupees.

$₹2800$ was split into two parts. One part was lent at $20\%$ per annum simple interest for $10$ years. The other part was lent at $25\%$ per annum simple interest for $20$ years. Each part yielded equal interest. Find the lower part (in₹)

A sum was split into three parts. The first part was lent at $10\%$ per annum for $4$ years. The second part was lent at $20\%$ per annum for $6$ years. The third part was lent at $30\%$ per annum for $5$ years. Each part was lent at simple interest and the same amount of simple interest was realised from each. Find the ratio of the first, second and third parts.

A certain sum was invested at a certain rate of simple interest. It took $20$ years to quadruple. Find the time that the sum would take to become $9$ times, if the rate of interest was $5$ percentage points more. (in years)

In calculating the time for charging the interest, the day on which the money is borrowed and the day on which money is repaid are _____(excluded/ included).

Find the simple interest on $₹3000$ at $10\%$ per annum from January $1$, $2007$ to March $15$, $2007$(in ₹)

_____ is calculated on the (original) principal for the entire loan period.

The extra amount paid by a borrower for using another person's money is called _____.

Time taken by a sum to double itself at $4\%$ per annum at simple interest is _____ years.

A sum was split into three parts. The first part was lent at $10\%$ per annum for $4$ years. The second part was lent at $20\%$ per annum for $6$ years. The third part was lent at $30\%$ per annum for $5$ years. Each part was lent at simple interest and the same amount of simple interest was realised from each. Find the ratio of the first, second and third parts.

A certain sum was deposited in a bank at $6\%$ per annum at simple interest for $3$ years. Had it been deposited at a rate of interest $2\%$ per annum more, the interest received would have been $₹750$ more. Find the sum.

The simple interest on$₹1800$  at $R\%$ per annum for $2$ years is equal to the simple interest on $₹4800$ at $15\%$ per annum for $1$ year. Find the simple interest (in $₹$) on $₹2400$  for $3$ years at $R\%$ per annum.