In order to solve this problem, we need to figure out what percent 2,430 is of 56,000. We do this by dividing 2,430 by 56,000. This is equal to 0.04339. We multiply this by 100 to get a percent. This is equal to 4.339%, so the tax rate is 4.339%.
An example of a unit rate would be driving a car at 50 miles per hour. 50 miles per every 1 hour is a unit rate.