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

int ratio(const unsigned int N, const unsigned int M) {\
    const unsigned int Z =(M / (double)N * 100 ) +1;
    if (Z >= 100) return -1;

    double tmp = ( (N*Z) - (100 * M) ) / (100.0 - Z);
    return (int)ceil(tmp);
}
int main() {
    int T;
    scanf("%d", &T);

    while (T--) {
        unsigned int N, M;
        scanf("%u %u", &N, &M);

        int res = ratio(N, M);
        printf("%d\n", res);
    }
}