First, you must find the total amount of solution. This is , or .

Now, the percentage of the solution that is blood can be represented:

, or

This is the same as % Rounded, it is %

To convert percentages to fractions, take the value and divide by .

Let's get rid of the decimal by multiplying top and bottom by or moving the decimal places to the right and adding zeroes to the bottom.

Then reduce by dividing the bottom by to get .

First convert the complex fraction into an improper fraction.

Multiply the number in front of the fraction with the denominator and then add that to the numerator.

Then to convert percentages to fractions, take the value and divide by .

Recall that the formula for percentage increase is:

, where is your ending value and is your starting value.

For our numbers, this would be:

Recall that to find a percentage from a decimal, you multiply by :

First write the percent as a decimal. To convert the decimal into a fraction, multiply the decimal by , then place that number over :

.

Then place over : .

Therefore,

.

Then, reduce the fraction to its lowest terms by dividing through by the greatest common factor of and , which is :

.

So, Lauren has finished of her homework.

To convert percentages to fractions, take the value and divide it by .

Then simplify as follows.