SRM_219_Div2_250

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cctype>
#include <stack>
#include <bitset>
#include <queue>
#include <list>
#include <vector>
#include <map>
#include <set>
#include <iterator>
#include <sstream>
#include <stdlib.h>
#include <cmath>
#define FOR(i,A) for(typeof (A).begin() i = (A).begin() ; i != (A).end() ; i++)
#define debug( x ) cout << #x << " = " << x << endl
#define clr(v,x) memset( v, x , sizeof v )
#define all(x) (x).begin() , (x).end()
#define rall(x) (x).rbegin() , (x).rend()
#define TAM 110

using namespace std;

typedef pair<int,int> ii ;
typedef long long ll ;
typedef long double ld ;
typedef pair<int,ii> pii ;
int t,tax,mon,bill;
int main() {
    scanf("%d",&t);
    while(t--){
        scanf("%d",&bill);scanf("%d",&tax);scanf("%d",&mon);
        double aux=(double) bill* (100.0 + tax) /100.0;
         int rest;
         rest = mon - (int) (aux + 0.000000001);/*el 0.000...1 es por el error
         ya que si no redondea como quisiera*/
         aux=(double)bill/100.0;
         int cont = (int) ((double) rest / aux);
         if(rest>=0){
            while (rest>= (int) ((double) bill * (cont+1) /100.0 )) cont++;
            printf("%d\n",cont);
         }else{
            printf("-1\n");
         }

    }
    return 0;
}