[백준/Python] 10984 - 내 학점을 구해줘

https://www.acmicpc.net/problem/10984

t = int(input())

for _ in range(t):  # 학기
    n = int(input())
    total = 0
    grade = 0

    for _ in range(n):  # 과목
        c, g = input().split()
        c, g = int(c), float(g)

        total += c
        grade += c * g

    grade /= total
    print(f"{total} {grade:.1f}")