/**

  • @param w number
  • @return number

*///wzy
var Solution = function(w){

if(w<=10)
{
    var a=w*0.32
    return a.toFixed(2)
}
if(w>10&&w<=20)
{
    var b=3.2+(w-10)*0.64
    return b.toFixed(2)
}
if(w>20)
{//wzy
    var c=3.2+6.4+(w-20)*0.96
    return c.toFixed(2)
}

}