Final answer:
To represent the total percent of their goal collected, one expression can be written as 100% + 18% = 118%. Another expression can be written as x% + 18%, where x% represents the original goal amount.
Step-by-step explanation:
To represent the total percent of their goal collected, we need to first find out how much additional goods were collected. If the original goal amount is represented as 100%, then the additional 18% of the goal can be added to it. So, the expression can be written as 100% + 18% = 118%.
Another way to represent the total percent collected is to calculate the percent of the original goal and add it to the percent of the additional goods collected. Let's say the original goal amount is x%. Then, the expression can be written as x% + 18%.