Counter troubles

/**
Hey guys im new to java programming and have an assigment to write a code to calculate the current population of a organism.
My problem is i cannot figure out how use my updated population size, he counter just keeps on calulating the population size of the
given number . ( Hope this is clear run the program and my problem wil be obvious)
*/

import java.util.Scanner;

public class Population
{
public static void main(String[] args)
{
double popsize;
double averagepopincrease;
double days;

Scanner keyboard = new Scanner(System.in);
System.out.println("Please enter the number of organisms");
popsize = keyboard.nextDouble();
if(popsize < 2)
System.out.println( "Must be atleast 2 oranisms");

Scanner keyboard1 = new Scanner(System.in);
System.out.println("Please enter the population increase as a decimal");
averagepopincrease = keyboard1.nextDouble();
if(averagepopincrease <= 0)
System.out.println( "Average Population increase cannot be a negative number");

Scanner keyboard2 = new Scanner(System.in);
System.out.println("Please enter the amount of days you wish to calculate");
days = keyboard2.nextDouble();

for( days = 1; days <= 10; days++)
{
System.out.println((popsize * averagepopincrease) + popsize);

}
}
}