Problem
Money in a savings account earns simple interest: each year adds rate percent of the original amount principal. Compute the total balance after years years.
Implement simple_interest_total(principal, rate, years).
Input
principal: The starting amount. rate: The yearly interest rate in percent. years: The number of whole years.
Output
Return principal + principal × rate / 100 × years.
Constraints
0 ≤ principal ≤ 1,000,000; 0 ≤ rate ≤ 100; 0 ≤ years ≤ 100
Examples
Input:
rate = 5.0
years = 2
principal = 1000.0
Expected output:
expected = 1100.0Input:
double rate = 5.0;
long long years = 2;
double principal = 1000.0;
Expected output:
double expected = 1100.0;Input:
double rate = 5.0;
long years = 2;
double principal = 1000.0;
Expected output:
double expected = 1100.0;Explanation
Each year earns 1000 × 5% = 50, so two years add 100: 1000 + 100 = 1100.
Input:
rate = 0.0
years = 10
principal = 250.0
Expected output:
expected = 250.0Input:
double rate = 0.0;
long long years = 10;
double principal = 250.0;
Expected output:
double expected = 250.0;Input:
double rate = 0.0;
long years = 10;
double principal = 250.0;
Expected output:
double expected = 250.0;Explanation
With a 0% rate nothing is added, so the balance stays 250.
How to approach it
Try on your own first, then open one hint at a time.
Hint 1
Simple interest uses the original principal every year, not the growing balance.
Hint 2
Compute the yearly interest once, then multiply by the number of years.
Hint 3
Make sure the final amount includes the starting principal as well as the accumulated interest.
Expected complexity
O(1) time, O(1) extra space
References
This challenge is adapted for CodeUtility. Follow the statement and constraints above.