求助，为何数据精度上出现错误

#include<iostream>
#include<cstdio>

using namespace std;

int main(){
    int n,k;
    cin>>n>>k;
    int a[10001],b[10001],ta = 0,tb = 0;
    int suma,sumb;
    double avea,aveb;
    for(int i = 1; i <= n;i++)
    {
        if(i%k == 0)
        {
            a[ta] = i;
            ta++;
        }
        else
        {
            b[tb] = i;
            tb++;
        }
    }
    for(int i = 0;i < ta; i++)
    {
        suma+=a[i];
    }
    for(int i = 0;i < tb; i++)
    {
        sumb+=b[i];
    }
    avea = suma / ta;
    aveb = sumb / tb;
    printf("%.1lf, %.1lf", suma / (double)ta, sumb / (double)tb);
    return 0;
}

求助各位大佬，为何跑样例时第二个数据结果为50.2QAQ