JSFiddle - React, Tailwind, and code Playground

JavaScript

var n = 190 ;

var hours = 0; 
if( n % 60 == 0 ){ 
    hours = n / 60;
}else{
    hours = parseInt(n / 60,10) +1; 
}

var price = 0;
if ( hours > 3 ){
    price = 50 *3 + (hours-3) * 50  * 0.5; //(0.5 = 五折)
}else{
    price = 50 * hours;
}

alert("時間為 " + n + " ,價格為 " + price);