#include <iostream>
using namespace std;

struct testCase {
    double rate;
    double balence;
    double payment;
};

//Function Prototypes
void inputCases(testCase* myCases,int n);
void outputResults(testCase* myCases,int n);

int main() {
    int numOfCases;
    cin>>numOfCases;
    testCase* myCases=new testCase[numOfCases];
    inputCases(myCases,numOfCases);
    outputResults(myCases,numOfCases);
    return 0;
}

//Function Definitions
void inputCases(testCase* myCases,int n) {
    for(int i=0; i < n; i++)
        cin>>myCases[i].rate>>myCases[i].balence>>myCases[i].payment;
}

void outputResults(testCase* myCases,int n) {
    for(int i=0; i < n; i++) {
        int numOfPayments=0;
        for(; myCases[i].balence > 0; myCases[i].balence-=myCases[i].payment) {
            if(numOfPayments > 1200) {
                cout<<"impossible"<<endl;
                break;
            }
            numOfPayments++;
            myCases[i].balence+=static_cast<double>(static_cast<int>((myCases[i].balence*(myCases[i].rate/100)+0.005)*100))/100;
        }
        if(numOfPayments <= 1200)
            cout<<numOfPayments<<endl;
    }
}