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#include <stdlib.h>

#include <stdio.h>

int main()

{

    int s,t,i;

    char a[];

    double x,y;

    double m,n;

    bool f;

    double z;

    scanf("%d",&s);

    while (s--)

    {

        f = true;

        m = ;n = ;

        scanf("%d",&t);

        for (i=;i<t;i++)

        {

            scanf("%s%lf%lf",a,&x,&y);

            if (y<)

                f = false;

            m = m+x;

            n = n+y*x;

        }

        z = n/m;

        if (f)

            printf("%.2lf\n",z);

        else

            printf("Sorry!\n");

        if (s)

            printf("\n");

    }

    return ;

}

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