Day 019 - Project 19 : Loan Calculator

If you have any questions, comments or issues with this project please post them here!

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Built an interest calculator to see how much money I would owe! A bit boring, I know, but necessary for #reallife.

Day 19 of #Replit100DaysOfCode #100DaysOfCode.

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Not sure how best to notify the group who puts the videos together. In the video for Day 19, at approximately the 1:22 mark, David says “…that help us loop, and create variables a” and then the video cuts to the graphic for Up Next : Range


I’m stuck at this challenge and need help.

I manage to find a method to replicate the answers as shown by David but can’t figure how to turn it into a code. I feel there are some necessary process or info that isn’t cover in David’s lesson video:

Can anyone help me please? I feel my process is wrong. I end up having to use exit( ) to end the loop as it will run 10 times of the same stuff.

This is David’s request:

You are going to create a loan calculator that shows how much money you owe for a loan of $1,000 with a 5% APR (APR is fancy for Annual Percentage Rate) over 10 years.

This means each year the amount of money you owe will increase 5%.

Figure out how much you owe altogether for 10 years?

Use a for loop and one or two lines of looped code to determine the answer. (Hint: Don’t make this overcomplicated. It should only be a few lines of code altogether.)

print("Loan Calculator")
print("$1000 over 10 years at 5% APR")
for initial_value in range(10):
  initial_value = float(input("Enter initial value: "))
  annual_percentage_rate = float(input("Enter APR value: "))
  year = float(input("Enter amount of year: "))
  interest1 = (initial_value * annual_percentage_rate)+ initial_value
  print("year1 is", interest1)
  interest2 = (interest1 * annual_percentage_rate)+ interest1
  print("year2 is", interest2)
  interest3 = (interest2 * annual_percentage_rate)+ interest2
  print("year3 is", interest3)
  interest4 = (interest3 * annual_percentage_rate)+ interest3
  print("year4 is", interest4)
  interest5 = (interest4 * annual_percentage_rate)+ interest4
  print("year5 is", interest5)
  interest6 = (interest5 * annual_percentage_rate)+ interest5
  print("year6 is", interest6)
  interest7 = (interest6 * annual_percentage_rate)+ interest6
  print("year7 is", interest7)
  interest8 = (interest7 * annual_percentage_rate)+ interest7
  print("year8 is", interest8)
  interest9 = (interest8 * annual_percentage_rate)+ interest8
  print("year9 is", interest9)
  interest10 = (interest9 * annual_percentage_rate)+ interest9
  print("year10 is", interest10)
  print("You paid $628.89 in interest!")

Why are you even looping? just get rid of the loop

Because David’s instruction is for me to “Use a for loop and one or two lines of looped code to determine the answer”: He also hinted:

  • Make sure the for loop happens 10 times.
  • Start your value (amount you are borrowing) before the loop starts.
  • If you need to count on one more number, just write i+ in the print statement to tell the computer to add the next number"

The loop is for recalculating the interests every year.
Also, you need to leave the inital values, any input, outside of the loop because it should only be asked for one time.
Therefore, your code should look like this:

print("Loan Calculator")
print("$1000 over 10 years at 5% APR")
interest = initial = float(input("Enter initial value: "))
annual_percentage_rate = float(input("Enter APR value: "))
years = float(input("Enter amount of year: "))

for year in range(years):
  interest *= annual_percentage_rate
  print(f"Year {year + 1}: {interest}")
print(f"You paid ${initial - interest} in interest!")

My code is simple (there ins’t any input) but I think it’s correct. Check it out!

Problem description

Question is bug solve the following:

total = 0
for number in range 100:
  total += number

Anwser given by Replit is the following: Add ( ) to 100

total = 0
for number in range (100):
  total += number

Expected behavior

This should print number 0 to 99

Actual behavior

Print 0 to 4950 because

Steps to reproduce

Go to replit learn Go 100 days python day 19





Device if mobile




Please upload screenshots

Hi @royvlasman , welcome to the forums!
Try entering kill 1 in the Shell to reboot the environment.

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I see the confusion, the example isn’t supposed to simply count up by 1 until it reaches 100. It’s supposed to add all of the numbers from 0 to 99 together.

0 + 0 = 0
0 + 1 = 1
1 + 2 = 3
3 + 3 = 6
6 + 4 = 10

and so on all the way until it reaches + 99

The program is behaving as it’s supposed to.

To make it clearer that that is what’s happening you can try this instead

total = 0
for number in range(100):
  oldtotal = total
  total += number
  print(oldtotal, "+", number, "=", total)