Arduino library for PAM8803 audio amplifier module

Using Arduino Audio
8

In the library code:

void Pam8803::setDigitalVolumeControl(int volumePin){
  digitalWrite(volumePin, LOW);
  delay(30*3.5);
  digitalWrite(volumePin, HIGH);
  delay(30);
};

What is the purpose of the 3.5 value in the delay statement? Would that cause the floating point math library to be pulled into the compiled code? Why not just a delay(105) statement?

Lefty