29.7

#include <stdio.h>
#include <math.h>

double product(unsigned int n)
{
    double res = 1;
    for(unsigned int i = 1; i <= n; ++i)
    {

        res*=(pow(i,2)+4)/(2.5*i);

    }
    return res;
}

double sum(unsigned int n)
{
    double res = 0;
    for(unsigned int i = 1; i <= n; ++i)
    {
        res+=(pow(i,3)+6)/(10.0 *i +1.0);
    }
    return res;
}

int main()
{
    unsigned int n = 9;
    double res = product(n)*sum(n);
    printf("res = %.4lf\n",res);
}