题目连接：http://acm.zzuli.edu.cn/problem.php?id=2260


AC代码：

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int main()
{
  double n,m;
  double sum = 0;
  scanf("%lf%lf",&n,&m);
  double x,y;
  while(~scanf("%lf",&x)){
    if(x == 0)break;
    scanf("%lf",&y);
    // if(x == 0)break;
    sum += n*(x/100);
    sum += m*(y/100);
  }
  printf("%.2lf\n",sum);
  return 0;
}