Identify Each of the Following as Nominal or Real Variables

Identify each of the following as nominal or real variables.
a. the physical output of goods and services
b. the overall price level
c. the dollar price of coffee
d. the price of coffee relative to the price of tea
e. the unemployment rate
f. the tips that you earn from your part-time serving job
g. the amount of goods you can purchase with the wage you get each hour
h. the income taxes that you pay the government