Percents and more generally rates are used in many situations. For an original post, find an example of an online article, blog, or advertisement that includes a percent or rate, copy and paste the web address, and write a short description of what the percent or rate represents. Here is an example (that you cannot re-use):

https://thehill.com/hilltv/rising/476978-trump-support-among-republicans-reaches-all-time-high-in-poll

90% of Republicans polled approve of President Trump's job performance.

For a reply, comment on the use of the percent or rate in context. Here is an example:

I am surprised that such a large percent of those surveyed approves of President Trump's job performance, even though it was just among Republicans. The article also mentioned that only 40% of independents and just 16% of Democrats approve of President Trump's job performance. The article also goes on to mention that his approval rating goes down 47% from the previous year & his disapproval rating goes up to 53%.