It will take 25 years for a 100 to double check if you have a simple interest of 4 percent.
If the interest is simple interest, then the 300,000 earns an additional 270,000 in 30 years (on top of the principle). If the interest is compound interest paid annually, then the 300,000 earns an additional 428,178.74 in 30 years (on top of the principle).
30 years
about 9.7 years
One year.
That depends on whether you are getting 5% simple interest, or compound interest, and how often it is compounded. Simple interest is very easy to calculate; you just multiply. $500 at 5% earns 5% of $500 every year, which is $25, so in 20 years the interest earned is 20 x $25 or $500, for a total of $1,000. But if you put the money in a savings account in a bank, you get compound interest. It can be compounded annually, semi-annually, quarterly, monthly, or daily. The more often it is compounded, the more you earn. Nowadays you can get daily interest, but that is kind of complicated because it depends on whether you figure the interest for every single day, 365 days a year and 366 in a leap year, or the traditional banking custom of 360 days a year. For example, if you compound annually, every year your balance is multiplied by 1.05, so after 20 years you would have 500 x 1.0520, which is $1.326.65 to the nearest cent.
331/3 percent simple interest will double any amount in 3 years.
About 8 years to double (divide 70 by the interest rate), and presumably another 8 years to double again? This supposes compound interest. For simple interest, 11 years to double and 33 to quadruple.
A simple interest rate of 10 per cent per year will double a sum of money in ten years.
20 YEARS
The same time that it will take for any other amount to double. However, for the actual calculations you need to know the interest rate.
Simple interest: 100/6 ie 16.67%
At what rate of simple interest will the interest on Rs.925 be two-fifth of it in 8 years?
It will take 20 years.
There is a quick and dirty way to convert simple interest to compound interest. First you need to know how long it will take to double your initial number. For Example: Let's say that you find an investment that pays 10% simple interest. That means it takes 10 years to double your investment. We then use the rule of 72 to determine the rate of compound return will give an equivalent time. The rule of 72 says that you divide either the rate of return or the time period into 72 to come up with the other. So, in this example we want to know what interest rate would double our money in 10 years. divide 72 by 10 = 7.2 This means that 7.2% compound interest is equal to 10% simple interest.
7% simple annual interest over 2 years = 14% total interest.14% of R528 = R73.92 .
$494.34 Interest= principal amount * time* simple interest %
Simple interest = 1000 * 5/100 * 3 = 150