What's wrong with my code? Hallowen candy case 3 and so on, i cant complete it

Question

#include <stdio.h>

int main() {
int houses;
scanf("%d", &houses);

//your code goes here
float per_dollar;
int testNum, checkNum, roundNum;
if (houses >= 3) {
per_dollar = (2/(float)houses) * 100;
testNum = per_dollar * 10;
checkNum = testNum % 10;

if(checkNum >= 5){
roundNum = per_dollar;
roundNum++;
}
else {
roundNum = per_dollar;
}
printf("%d",roundNum);
}
return 0;
}

Answer 1

Unfortunately there is a math problem in accuracy in your calculation of the checkNum. A solution is:
testNum = per_dollar * 1000;
checkNum = testNum % 1000;

Better is to use build in function ceil().

Answer 2

Hint: there will be searched a percentage chance of 2 in hoses (number).

Answer 3

Thank you sir, very much appreciated

Answer 4

Thank you for the hint sir but can you elaborate it please cuz i don't what you really mean sir thank for helping :)