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20% means that 20 will replace percent in our proportion. Substitute: Now we can substitute these values into our proportion.
and how would we solve this problem: What is 20% of 45? 40% means that 40 will replace percent in our proportion.
The phrase of what number represents the whole and is the unknown quantity.
Analysis: In this problem, you are being asked 8 is what percent of 20?
You are given two numbers from the proportion above and asked to find the third.
The percent is the unknown quantity in this problem. Identify: The phrase 8 is means that 8 is the part.
The phrase what percent tells us that percent is the unknown quantity.
We will let variable x represent this unknown quantity in our proportion.
Substitute: Now we can substitute these values into our proportion.
To solve problems with percent we use the percent proportion shown in "Proportions and percent".
$$\frac=\frac$$ $$\frac\cdot =\frac\cdot b$$ $$a=\frac\cdot b$$ x/100 is called the rate.