How to calculate the percentage of the amount?
If you need to calculate percentages without a calculator, then at school we were taught this way: 3000 (as in your example), multiply by 3 (the number of percentages), 9000 is obtained and this divided number is divided into 100. It turns out 90.
Interesting calculations, let's say we are minus 18% from 100 000, we do 100 000 on the calculator - 18%, we get 82 000. And if you drop 82% on 000 18, you get 96 760. So think how to understand, we will return you money minus VAT.
Elementary Watson. You take 3000, multiply by the number of percentages (in this case we have 3) and then divide it into 100. It turns out 3000 * 3 / 100 = 90. All genius should be simple. This is his genius.
I remember we were taught in school, it was a long time ago, but I remembered it for the rest of my life. You need to divide the sum by one hundred and multiply by the number of percentages. In this case, 3000 is divided into 100, multiplied by 3 = 90. 90 and will be 3% of the amount of three thousand.
Interest calculation - this is not the most difficult in mathematics.
To find the value that in this example is 3% of the number of 3000, 3% is multiplied by 3000 and divided by 100%. As a result, we get 90.
It can be done in a different way: first 3000 is divided into 100, i.e. move the comma two signs to the left. We get 30. And now 3 multiply by 30. We get the desired 90.
This is in case you do not have a calculator at hand.
You can calculate the percentage of the amount in two ways.
The first method. Calculate the percentage of each of the summands of the sum and add the results.
(a + b) * x% = a * x% + b * x%
The second method. Calculate the amount and find a percentage of this amount. Those.
(a + b) = c
(a + b) * x% = c * x%
The percentage of the amount can be calculated in several ways:
1.from the school course of mathematics - take a number, in your case 3000 divide it by 100% (, and multiply by 3, get 90.
2.can 3000 multiply by 3% and then divide by 100% (we move the comma two characters to the left), we get 90.
3.can our number 3000 multiply by 0,03 (3% divided by 100%), we get 90.
4.can calculate on the calculator.
I have two options for calculating this example. More precisely, the options that I use:
First option. It is necessary to make a proportion.
100% - 3000.
From here we get 3000 * 3% = 100% x, then x = (3000 * 3%) / 100%. It turns out 90.
The second option. (3% * 3000) / 100%. It turns out the same, only without proportion. But, usually the proportion is easier.
In your example, you can calculate the percentage and sums of 3% from 3000 in several ways, and all of them are fairly simple, and can be used practically in any situation, especially when shopping in stores or on the market, I always do so. In general, 3000 is divided into 100, the resulting number is 30 is 1% of the original number, then 30 (that is, 1%) is multiplied by 3 (since we need to find a number that is 3% of the original amount) and get 90, and this 3% of the given number.
It looks something like this: 3000 / 100 * 3 = 90
It is possible to make still other way, for example to find 8% from 100: 100 * 0.08 = 8
Simple calculations without a calculator are always human.
If the condition is given that there is an amount in 3000 and it is necessary to calculate how many will be 3% of this ill-fated amount in 3000, then I personally go in the form with proportions (taught by the teacher's head)
3000 - 100%
x - 3%
x = 3000 * 3 / 100 = 90
You can do it more quickly:
x = 3000 * 0,03 = 90
where 0,03 is the coefficient (3 / 100)
The easiest way to start is to find out how much is one percent of the amount.
To do this, divide the entire amount (in your case - 3000) on 100 (one percent is the hundredth part of something).
After that, the result (in your case 30) is multiplied by the interest number (in your case 30x3 = 90).