Help me in solving GYMDAY problem

help
,
1

My issue

	int d,x,y;cin>>d>>x>>y;
	float k=(100.0*(y-x))/(100.0-x*d);
	cout<<k<<endl;
	if(k!=(int)k || k<0 || k>=y) cout<<-1<<endl;
	else cout<<k<<endl;

this code is failing for tc: 2 50 50
the output should be 0

My code

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

int main() {
	// your code goes here
	int t;cin>>t;
	while(t--){
    	int d,x,y;cin>>d>>x>>y;
    	float k=(100.0*(y-x))/(100.0-x*d);
    	cout<<k<<endl;
    	if(k!=(int)k || k<0 || k>=y) cout<<-1<<endl;
    	else cout<<k<<endl;
    
    }

}

Problem Link: International Gym Day Practice Coding Problem