# 4.4:  Opening and reading through revenue.csv, build a list from the 3rd field (the floating point
# value), then sum up the values using sum().  (Hint:  sum() will not work unless you convert each
# element to a float value before you add it to the list, so do that by calling float() on each
# item.)

# Expected Output:

# 662.01
# 
# # may have a tiny remainder, i.e., 662.0100000000001

