Multiply the principal (P) by the annual* interest rate as a decimal (r) and the time in years* (t). *The time period may be expressed in months, etc.
For example, $2000 invested at 7% simple interest for 5 years: I = Prt = 2000x0.07x5 = 140x5 = $700.
Carter invested $200 in a savings bond that pays simple interest according to the formula below.
I = Prt
In the formula, I represents interest, P represents the money invested, or principal amount, r is the simple interest rate, and t represents the time, in years, that the money is invested.
If the savings bond pays 4% interest, how much interest will Carter earn after 6 years
A $5000 investment at an annual simple interest rate of 4.4% earned as much interest after one year as another investment in an account that earned 5.5% annual simple interest. How much was invested at 5.5%?
find the interest on $4000 at 3.5% annual interest for 1 year 6 months
$2400
the interest rate is lower than on comparable investments
What is the amout of interest that will be earned on an investment of $8000 at 10% simple interest for 3 years
No. I is as described for the stated period.
Compound interest gives you more, but at a low interest rate (less than 10%), the difference is negligible.
320
Simple interest (compounded once) Initial amount(1+interest rate) Compound Interest Initial amount(1+interest rate/number of times compounding)^number of times compounding per yr
If the interest is simple interest, then the value at the end of 5 years is 1.3 times the initial investment. If the interest is compounded annually, then the value at the end of 5 years is 1.3382 times the initial investment. If the interest is compounded monthly, then the value at the end of 5 years is 1.3489 times the initial investment.
The amount of interest earned on an investment of C, for y years at r per cent is C*y*r/100.
There are many simple interest calculators online that you can find. I found the one at http://easycalculation.com/simple-interest.php to be simple and accurate.