Flowering Monthly Interest
What you see above this is the concept of interest rates, the interest paid every year (yearly compound interest). However, there is also the interest rates paid interest each month (monthly compound interest).
For example, we will use the same numbers with the example above, where you put money Rp 1 million. Only difference, you do not open it in the form of deposit accounts, but the savings.
For simplicity, let’s say it also provides savings interest rate of 12 percent per year, payable monthly. This means that, at each end of the month, the interest you earn is not 12 percent, but 12 percent divided by 12, or 1 percent. This is because there are 12 months a year.
Thus, the calculation of your investment balance at the end of the first month are:
Rp 1.000.000 + (Rp 1,000,000 x 1 per cent) = Rp 1.000.000 + Rp 10,000 = Rp 1,010,000.
At the end of the second month, your balance becomes:
100 USD $ 1,010,000 + (USD 1,010,000 x 1 per cent) = USD $ 1,010,000 + USD 10,100 = USD 1,020,100
And so on every month until the end of the month your balance becomes 12:
USD $ 1,115,668 + (USD 1,115,668 x 1 per cent) = USD $ 1,115,668 + Rp 11,157 = Rp 1,126,825.
If this continues until the end of the 10 (or months to 120), your investment balance to $ 3,300,387. More than if you use the annual interest rate.
Flowering Daily Interest
What about the interest rate system that paid a daily basis (daily compound interest)? Many banks offer advertising savings products that provide a daily interest like this. The concept is similar to the monthly interest rate. The difference is, the interest is not divided by 12, but 365 (according to the number of days per year), until the amount is 0:03 per cent per day.
Now we will calculate how many you get. Once again, we use the example as above.
Your balance at the end of the first day are:
Rp 1.000.000 + (Rp 1,000,000 x 0.03 percent) = Rp 1.000.000 + USD 329 = USD 1,000,329.
And so on until after a year (or the end of the day to 365) your balance becomes:
USD $ 1,127,104 + (USD 1,127,104 x 0.03 percent) = USD $ 1,127,104 + USD 371 = USD 1,127,475.
If continued until 10 years, then at the end of the day into 3650, your balance will be
Rp 3.319.462. More than if you use the bank interest rate monthly.
You have seen that the differences in the use of interest can affect your investment balance at the end of the year, although all are equally promising 12 percent interest per year. The reason is simple: because the amount of interest you receive is different.
Different flowers that you can then bring the term “effective rate” (effective rate). The ratio of the amount of interest you earn at the end of the year, with the amount of money you entered. How to calculate the effective interest rate is very simple: the interest you receive at the end of the year divided by the nominal value of your money at the beginning of the year.
So, if there is an investment product that promised 12 percent interest rate per year, then it might be the effective rate is not 12 percent. What you receive at the end of the year may be more than 12 percent. By knowing the effective interest rate, then the difference is you get to be really visible.
In addition, the effective interest rate also allows you to speed up your calculations. That is, if we use our earlier example of Rp 1,000,000 as initial fund your investment, then for the next, we can just change it to $ 5,000,000.
You also do not need anymore calculating how much interest you get when using the system daily interest rates, for example. You do not need to calculate interest over and over again until 365 times. Simply multiply by 12.74 percent, or multiply the USD 5 million was with 12.74 percent.