#include <iostream>
#include <iomanip>
#include <cmath>
#include <limits>
using namespace std;
float proc[200000];
float wtorn[200000];
int testy;
float z[200000], q[200000];
float wynik[100000];
int main()
{
cin >> testy;
int i;
for (int i=0; i<testy; i++)
{
cin >> proc[i] >> wtorn[i];
}
i=0;
for (int i=0; i<testy; i++)
{
z[i]=100-proc[i];
q[i]=z[i]*(1-(wtorn[i]*0.01));
wynik[i]=(100-q[i]);
if(wynik[i]-int(wynik[i]) == 0)
{
cout <<wynik[i] <<".00"<<endl;
}
else if(wynik[i]-int(wynik[i]) != 0)
{
cout <<setprecision(2)<<wynik[i]<<endl;
}
}
}
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