Train transport rate

function calculateCost(d:Number, type:int):int {
    var count:int = 0;
    var cost:Number = 0;
    while(count < 4 && d > 0){
        if(d >= 100 && count < 3) cost += 100*getTypeCost(type, count);
        else if(d > 0) cost += Math.ceil(d)*getTypeCost(type, count);
        d -= 100;
        count++;
    }
    return Math.round(cost);
}
function getTypeCost(type:int, count:int):Number {
    switch (type){
        case 1: return (count == 0?0.932:(count==1?0.853:(count==2?0.785:0.739)));
        case 2: return (count == 0?0.488:(count==1?0.420:(count==2?0.375:0.336)));
        case 3: return (count == 0?0.215:(count==1?0.180:(count==2?0.160:0.145)));
    }
    return 0;
}