pragma solidity ^0.4.18;
contract MathTests {
    uint month = 30 days;
    uint endTime = now + month;
    uint punishTime = now + (endTime-now)/2; // simulating that punished occured half way the subscription
    uint startTime = now;
    function getDivided(uint numerator, uint denominator) public constant returns(uint quotient, uint remainder) {
        quotient  = numerator / denominator;
        remainder = numerator - denominator * quotient;
    }
   function percent(uint numerator, uint denominator, uint precision) public constant returns(uint quotient) {
         // caution, check safe-to-multiply here
        uint _numerator  = numerator * 10 ** (precision+1);
        // with rounding of last digit
        uint _quotient =  ((_numerator / denominator) + 5) / 10;
        return ( _quotient);
  }
  // 8 tokens => return 4 (punish time is 1/2)
function precentFixed() public view returns(uint){
    uint tokens = 8;
    uint pre = tokens * percent(punishTime - startTime,endTime - startTime,2);
    uint res = pre / 100;
    return res;
}

}