Write an inequality that represents the fact that while making your product you can't exceed this spending limit.

The total amount of money im willing to invest: $500
What im making: Sanrio hats
The hats will be made out of yarn & stitch! the cost of yarn is 3 but since there are so many characters i will buy yarn for each character (yarn × character)
each hat will be $10

pls help me w writing an equality