All GRE Math Resources
Example Question #1 : Percentage
What percentage of a solution is blood if it contains ml blood and ml water? Round to the nearest thousandth?
First, you must find the total amount of solution. This is , or .
Now, the percentage of the solution that is blood can be represented:
This is the same as % Rounded, it is %
Example Question #2 : Percentage
What is the percentage increase of an account that began with a balance of and increased to ?
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 :