function TradeComissions([town, sales]){
  sales = Number(sales);
  let comission = 0

  if(town == "Sofia"){
      if(sales >= 0 && sales <= 500){
       comission = sales * 0.05
      }else if(sales > 500 && sales <= 1000){
       comission = sales * 0.07
      }else if(sales > 1000 && sales <= 10000){
       comission = sales * 0.08
      }else if(sales > 10000){
       comission = sales * 0.12
      }else{
        console.log("error")
      }
  }else if(town == "Varna"){
      if(sales >= 0 && sales <= 500){
        comission = sales * 0.045
      }else if(sales > 500 && sales <= 1000){
        comission = sales * 0.075
      }else if(sales > 1000 && sales <= 10000){
        comission = sales * 0.10
      }else if(sales > 10000){
        comission = sales * 0.13
      }else{
        console.log("error")
      }
  }else if(town == "Plovdiv"){
      if(sales >= 0 && sales <= 500){
        comission = sales * 0.055
      }else if(sales > 500 && sales <= 1000){
        comission = sales * 0.08
      }else if(sales > 1000 && sales <= 10000){
        comission = sales * 0.12
      }else if(sales > 10000){
        comission = sales * 0.145
      }
  }else{
    console.log("error")
  }

  if(sales < 0){
    console.log("error")
  }
  console.log(comission.toFixed(2))
}
TradeComissions(["Sofia", 1500])