When a quantity grows (gets bigger), then we can compute its PERCENT INCREASE.
When a quantity shrinks (gets smaller), then we can compute its PERCENT DECREASE.
These concepts are thoroughly explored on this page.
Percent Increase
When a quantity grows (gets bigger), then we can compute its PERCENT INCREASE: 
Visualizing Percent Increase
NOTE:
If $\,\text{percent increase} = 75\%\,$, then the formula $$\text{percent increase} = \frac{\displaystyle{(\text{new}  \text{original})}} {\displaystyle\text{original}} $$ becomes $$75\% = \frac{\displaystyle{(\text{new}  \text{original})}} {\displaystyle\text{original}} $$ and solving for ‘new’ gives: $$ \text{new} = \text{original} + 75\%(\text{original}) $$ 
CONCEPT QUESTIONS EXERCISE:
On this exercise, you will not key in your answer.However, you can check to see if your answer is correct. 
PROBLEM TYPES:
