Add interest.py

.gitignore

@@ -1 +1,2 @@
 data/
+interest_report.md

interest.py

@@ -0,0 +1,30 @@
+def calculate_interest():
+    years = int(input("How many years do you want to invest? "))
+    monthly_investment = float(input("How much money will you invest each month? "))
+    interest_rate = float(input("What is the annual interest rate (in percentage)? ")) / 100
+    currency = input("What is the currency? ")
+    is_currency_before = input("Is the currency symbol/word before the value? (yes/no) ") == 'yes'
+    thousands_sep = input("What thousands separator would you like to use? ")
+
+    money = 0.0
+    interest_per_month = interest_rate / 12
+
+    md_table = "| Year | Month | Money gained from Interest | Total Money |\n|------|-------|---------------------------|-------------|\n"
+
+    for year in range(1, years + 1):
+        for month in range(1, 13):
+            gained_interest = money * interest_per_month
+            money += gained_interest + monthly_investment
+
+            money_string = f"{currency}{format(money, ',.2f').replace(',', thousands_sep)}" if is_currency_before else f"{format(money, ',.2f').replace(',', thousands_sep)}{currency}"
+            gained_interest_string = f"{currency}{format(gained_interest, ',.2f').replace(',', thousands_sep)}" if is_currency_before else f"{format(gained_interest, ',.2f').replace(',', thousands_sep)}{currency}"
+
+            md_table += f"| {year} | {month} | {gained_interest_string} | {money_string} |\n"
+            
+    with open("interest_report.md", "w") as file:
+        file.write(md_table)
+
+    return md_table
+
+print(calculate_interest())
+