問題
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.
制約
0 ≤ principal ≤ 1,000,000; 0 ≤ rate ≤ 100; 0 ≤ years ≤ 100
例
例 1
入力：
rate = 5.0
years = 2
principal = 1000.0
期待される出力：
expected = 1100.0入力：
double rate = 5.0;
long long years = 2;
double principal = 1000.0;
期待される出力：
double expected = 1100.0;入力：
double rate = 5.0;
long years = 2;
double principal = 1000.0;
期待される出力：
double expected = 1100.0;解説
Each year earns 1000 × 5% = 50, so two years add 100: 1000 + 100 = 1100.
例 2
入力：
rate = 0.0
years = 10
principal = 250.0
期待される出力：
expected = 250.0入力：
double rate = 0.0;
long long years = 10;
double principal = 250.0;
期待される出力：
double expected = 250.0;入力：
double rate = 0.0;
long years = 10;
double principal = 250.0;
期待される出力：
double expected = 250.0;解説
With a 0% rate nothing is added, so the balance stays 250.
参考資料
この課題はCodeUtility用に調整されています。上記の説明と制約に従ってください。