Suppose that your salary is 10,000 rubles a month. This number will be divisible by the first fraction. Since your salary is your entire income for the month, we will take it for 100 percent. This number will be a divisor of the first fraction. So, the first roll - 10000/100. Make a fraction with your numbers.
You need to calculate the tax that will be withheld from your paycheck per month. The tax to incomes of physical persons in our country is 13 percent. This number will be a divisor of the second fraction. And since the amount deducted from you tax we don't know, let's call it "x". The number "x" is divisible by the second fraction. So the second fraction is x/13.
Make proportion, that is, write both the fraction and put between them a sign of equality. Our proportion of 10000/100=x/13.In order to solve the proportion, you need to multiply the end members proportions and share them on the remaining member. For example: x=10000*13/100. Hence, x=1300. This is the amount of tax withheld from you in a month with an income of 10,000 rubles. Decide your proportion.