문제
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.
제약 조건
0 ≤ principal ≤ 1,000,000; 0 ≤ rate ≤ 100; 0 ≤ years ≤ 100
예시
입력:
rate = 5.0
years = 2
principal = 1000.0
예상 출력:
expected = 1100.0입력:
double rate = 5.0;
long long years = 2;
double principal = 1000.0;
예상 출력:
double expected = 1100.0;입력:
double rate = 5.0;
long years = 2;
double principal = 1000.0;
예상 출력:
double expected = 1100.0;설명
Each year earns 1000 × 5% = 50, so two years add 100: 1000 + 100 = 1100.
입력:
rate = 0.0
years = 10
principal = 250.0
예상 출력:
expected = 250.0입력:
double rate = 0.0;
long long years = 10;
double principal = 250.0;
예상 출력:
double expected = 250.0;입력:
double rate = 0.0;
long years = 10;
double principal = 250.0;
예상 출력:
double expected = 250.0;설명
With a 0% rate nothing is added, so the balance stays 250.
접근 방법
먼저 스스로 풀어 본 뒤 힌트를 하나씩 열어 보세요.
힌트 1
Simple interest uses the original principal every year, not the growing balance.
힌트 2
Compute the yearly interest once, then multiply by the number of years.
힌트 3
Make sure the final amount includes the starting principal as well as the accumulated interest.
예상 복잡도
O(1) time, O(1) extra space
참고 자료
이 문제는 CodeUtility에 맞게 수정되었습니다. 위의 설명과 제한 조건을 따르세요.