import os.path

filename = input("Please enter filename: ")
while not os.path.exists(filename):
    print("That file does not exist.")
    filename = input("Please enter filename: ")

infile = open(filename, 'r')
data = infile.readlines()
infile.close()

total = sum([float(v) for v in data])
avg = total / len(data)

total = format(total, '2f')
avg = format(avg, '2f')

print('The total is: $', total, sep='')
print('The average per day is: $', avg, sep='')