learning variables in datetype

#my variables

cup="water"
print cup

room="chair"
print room

house="people"
print house

rose="sackie"
print rose

tree="apple"
print tree

father="son+daughter"
print father

money="credit"
print money

month="may"
print month


#my type calculator

pizza=17.40
tax=0.03
tip=0.15
lunch=pizza+pizza*tip
payment=lunch+pizza*tip
print payment