data_strings = ["10.0", "20.0", "30.0", "40.0", "50.0"]
data_floats = []

for i in range(len(data_strings)):
    data_floats.append(float(data_strings[i]))


def add (f, total):
    return total + f

total = 0 
    
for f in data_floats:
    total = add(f, total)

print(total)