A (blank) is a ratio in which the first term is compared to 100

Answer: Percent

Step-by-step explanation: A percent is a ratio of a number to 100 or a ratio that compares a number to 100.

Percents are all around us. If you've ever been to a store, you will often see signs that say stuff like 25% off or 50% off especially around the holidays. These types of percents show you how much of a discount you will be getting.

When you go out to dinner, your parents figure out how much to tip the servers which is also calculated in percentages as well.