Methods and parameter help

[BionicBunny]

Hey guys, I'm new to programming and need help with an assignment. I have the following method and for the assignment it wants us to create two parameters. The first one is a Salary, and the second one is based on a list of performance bonus (P1= 64%, P2= 60%, etc.) How do i approach this problem?

@Override
	import com.nyt.exam02.IBonus;

public class Bonus implements IBonus {

	

	

	
float _Salary= 0; 
	@Override
	public float getBonus() {
		// TODO Auto-generated method stub
		int bonus = (this._Salary+ P1);
		
		return 0;
	}

	float __Salary= 0; 
	@Override
	public float getTaxedBonus() {
		// TODO Auto-generated method stub
		
		return 0;
	}

	@Override
	public String getVendorEmail() {
		// TODO Auto-generated method stub
		
		
		return "";
	}

	@Override
	public void setUp(float Salary, String Performance) {
		// TODO Auto-generated method stub
		this._Salary= Salary;
		this.__Salary= Salary;
		
		double P1=  (Salary*.64);
		double P2= (Salary*.60);
		double P3=  (Salary*.56);
		double P4=  (Salary*.52);
		double P5=  (Salary*.48);
		double P6=  (Salary*.44);
		double P7=  (Salary*.40);
		double P8= (Salary*.36);
		double P9=  (Salary*.32);
		double P10=  (Salary*.28);
		double P11=  (Salary*.24);
		double P12= (Salary*.20);
		double P13=  (Salary*.16);
		double P14= (Salary*.12);
		double P15= (Salary*.8);
		double P16= (Salary*.4);
		double P17=  (Salary*0);