Ticket Office in python, Why?

Question

"""You are analyzing sales data from a ticket office.
The ticket for an adult is $20, while the ticket for a child under 18 is $5.
The data you are given is in a dictionary format, where the keys are the sold ticket numbers, and the values are the customer ages.
For example, "123-08": 24 means that the ticket was bought a 24 year old.
Your goal is to calculate how much more money the office would make if it would change the ticket discount age to the given input.
So, your program needs to take an integer as input and output the percentage of revenue growth, if the discount was given to people under that age.
For example, if the office made $15000 with the original discount age, and would make $18000 with 14 as the discount age, then the growth would be ((18000-15000)/15000)*100 = 20%
So, for the input 14, your program should output 20. The output should be an integer (use int() to convert the result)."""
data = {
"100-90": 25, "42-01": 48, "55-09": 12, "128-64": 71, "002-22": 18, "321-54": 19, "097-32": 33, "065-135": 64,
"99-043": 80, "111-99": 11, "123-019": 5, "109-890": 72, "132-123": 27, "32-908": 27, "008-09": 25, "055-967": 35,
"897-99": 44, "890-98": 56, "344-32": 65, "43-955": 59, "001-233": 9, "089-111": 15, "090-090": 17, "56-777": 23,
"44-909": 27, "13-111": 21, "87-432": 15, "87-433": 14, "87-434": 23, "87-435": 11, "87-436": 12, "87-437": 16,
"94-121": 15, "94-122": 35, "80-089": 10, "87-456": 8, "87-430": 40
}
age = int(input())
# your code goes here by Kushal Bhoopalam
new = 0
old = 530
for var in data.values():
if var < age:
new += 5
else:
new += 20
if age < 18:
print(int((new - old) / old * 100))
else:
print(0)
#why old = 530 ???, Please help me know!

Answer 1

If you do the same calculation to get 'new' with the age as 18, you get the value for 'old' as 530. Which you should know, because you were supposed to have calculated this value yourself in your code.

Answer 2

instead of hardcoding value of old let your program calculate it
age = int(input())
new = 0
old = 0
for x in data.values():
old += 5 if x < 18 else 20
for var in data.values():
new += 5 if var < age else 20
if age < 18:
print(int((new - old) / old * 100))
else:
print(0)

Answer 3

Ok. I fixed it

Answer 4

for var in data.values():
new +=5 if var < 18 else 20

Answer 5

Thank you.

Answer 6

data = {
"100-90": 25, "42-01": 48, "55-09": 12, "128-64": 71, "002-22": 18, "321-54": 19, "097-32": 33, "065-135": 64, "99-043": 80, "111-99": 11, "123-019": 5, "109-890": 72, "132-123": 27, "32-908": 27, "008-09": 25, "055-967": 35, "897-99": 44, "890-98": 56, "344-32": 65, "43-955": 59, "001-233": 9, "089-111": 15, "090-090": 17, "56-777": 23, "44-909": 27, "13-111": 21, "87-432": 15, "87-433": 14, "87-434": 23, "87-435": 11, "87-436": 12, "87-437": 16, "94-121": 15, "94-122": 35, "80-089": 10, "87-456": 8, "87-430": 40
}
age = int(input())
main = 0
new = 0
for original in data.values():
if original >= 18:
main += 20
else:
main += 5
main_total = main
for change in data.values():
if change >= age:
new += 20
else:
new += 5
new_total = new
Growth = (new_total - main_total) / main_total * 100
print(int(Growth))

Answer 7

#A simple and effective code
age = int(input())
#your code goes here
new = 0;
old = 0;
for i in data.values():
old += 5 if i<18 else 20
new +=5 if i<age else 20
print(int(((new - old)/old)*100))