B

#include <bits/stdc++.h>
using namespace std;

int main() {
    int t;
    cin>>t;

    while(t--){
        int x, y;
        cin >> x >> y;

        double h = (10.0 * (y-x))/(100-y);
        int hours = ceil(h);

        cout << hours << endl;
    }
}