void setup() {
  Serial.begin(9600);
  float sum = 4444
  if (sum >= 1000 && sum < 2000){
    float sum = sum * 0.95;
    Serial.println(sum);
  }else if( sum >= 2000 && sum < 5000){
    float sum = sum * 0.9;
    Serial.println(sum);
  }else{
    float sum = sum * 0.85;
    Serial.println(sum);
  }

}

void loop() {
  // put your main code here, to run repeatedly:

}