*For instance if one package of cookies contain 20 cookies that would mean that 2 packages contain 40 cookies $$\frac=\frac$$ A proportion is read as "x is to y as a is to b".*$$\frac=\frac$$ $$\frac\cdot =\frac\cdot y$$ $$x\cdot b=\frac\cdot y$$ $$xb=ay$$ The products xb and ay are called cross products.

So they are easier to compare than fractions, as they always have the same denominator, 100. The amount saved is always the same portion or fraction of the price, but a higher price means more money is taken off.

Interest rates on a saving account work in the same way.

Percent means hundredths or per hundred and is written with the symbol, %.

Percent is a ratio were we compare numbers to 100 which means that 1% is 1/100.

In the example of 5The amount is the number that relates to the percent. Once you have an equation, you can solve it and find the unknown value.

## How To Solve Percent Problems Using Proportions Stanford Business School Essay

To do this, think about the relationship between multiplication and division.

Jeff wonders how much money the coupon will take off the original 0 price.

In a percent problem, the base represents how much should be considered 100% (the whole); in exponents, the base is the value that is raised to a power when a number is written in exponential notation. Since the percent is the percent off, the amount will be the amount off of the price.

There are two different methods that we can use to find the percent of change.

We begin by subtracting the smaller number (the old value) from the greater number (the new value) to find the amount of change.

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