Calculate the interest

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#1

Hello, I have difficulty understanding part of the code of the following question:

You want to invest capital 𝐢0 for n years at an annual interest rate of i%.
The relation is given by: 𝐢 = 𝐢0*(1 + 𝑖)^𝑛.
Write a program giving you the amount earned, the interest (𝐼 = 𝐢 βˆ’ 𝐢0) of your
investment, as well as the equivalent monthly interest rate π‘–π‘š under the database
provided. π‘–π‘š = (1 + 𝑖)^(1/12) βˆ’ 1.

The following would be the answer:

from math import *

C0 = float(input(β€˜Starting capital: β€˜))
i = float(input("Annual interest rate: "))
i = i / 100
u = 1 + i
n = int(input("Number of years: "))
print(’’)

C = C0 * (un)
I = C - C0
im = u(1/12) - 1

C = int(100 * C)/100
I = int(100 * I)/100
im = int(10000 * im)/100

print(β€˜Capital after’, n, β€˜years:’, C, β€˜β‚¬β€™)
print('Interest: ', I, β€˜β‚¬β€™)
print("Monthly interest rate: ", im, β€˜%’)

The code I don’t understand is the following:

I do not understand why this was written, what it means and how it affects the code:

C = int(100 * C)/100
I = int(100 * I)/100
im = int(10000 * im)/100

Many thanks for who can help me out!

#2

If you’re posting code to the forums please see: How do I format code in my posts? which lets you keep the original text its indentation and formats it nicely. Do you have a link to the lesson?

Seems like a coarse route to try and round values (trimming non significant figures). If you want to see the different print once before those steps and then print again afterwards.

#3

the code is in a pdf document.