In the exercise "Clash of Clans and Math", we find out that the unit rate for gems is 100 gems per dollar when you buy 500 gems at a time.
Let's say you can also buy 1200 gems at a time for 10 dollars. What is the unit rate for gems now - that is, how many gems do you get for every dollar?
Unit rate =
gems per dollar
Aligned with Common Core:
6.RP.2 - Understand ratios and unit rates