Business program for a computer shop
Wording

First, the terminology you chose seems a bit off.  I believe that you are writing this program from the point of view of an entrepreneur or investor in a business, looking to earn income by making computers available for training and general use.  Instead of "cost", you should be talking about price.

There are also some spelling mistakes ("Maximum" → "maxim", "number of computers" → "number of computer", and "month" → "mouth").

Misuse of variables

This program is basically a textual spreadsheet that accomplishes this (inputs in italic, outputs in bold):



As such, there are many variables to track, and therefore proper naming is critical to keep track of all of those numbers.  More importantly, you should not repurpose a variable midway through the program, as you have done here:


training = training * computer_training * open;



and


max = (max * 52 / 12);



Such reassignments prevent you from naming the variable appropriately, and from reasoning about the code.  In fact, the resulting confusion has led to a bug.  The assignment two = 0.2 * max is based on max as a weekly amount.  You subsequently reassigned max = (max * 52 / 12) as a monthly amount.  You then report two as a monthly amount:


System.out.println("estimated monthly income at mouth 1-3 \t:"+ two );



You would be better off with fewer variables, by eliminating variables two, etc.

Style

Nobody likes to read huge declaration blocks:


double training,p_h,computer_training,computers,open;

double max,two,thre,four,five;
double two2,thre3,four4,five5,p; 



Instead, declare the variables at the assignment point.

You can make use of import static to avoid writing System.out everywhere.

import java.util.Scanner;
import static java.lang.System.out;

public class BusinessEstimator {
    public static void main (String args []) {
        try (Scanner input = new Scanner(System.in)) {
            out.print("please enter price of training people up on the computer p/h: £");
            double trainingPrice = input.nextDouble();

            out.print("please enter price to use the pc p/h for general use: £");
            double generalPrice = input.nextDouble();

            out.print("please enter number of computers in the shop for training: ");
            double trainingComputers = input.nextInt();

            out.print("please enter number of computers in the shop for general use: ");
            double generalComputers = input.nextInt();

            out.print("please enter hours open per week: ");
            double hoursPerWeek = input.nextDouble();

            double trainingWeeklyIncome = trainingPrice * trainingComputers * hoursPerWeek;
            double generalWeeklyIncome = generalPrice * generalComputers * hoursPerWeek;
            double maxWeeklyIncome = trainingWeeklyIncome + generalWeeklyIncome;
            double maxMonthlyIncome = maxWeeklyIncome * 52 / 12;

            double WAGES_PCT = 0.45;  // % of shop taking paid as wages

            out.println();

            out.println ("maximum monthly income from the computers £ "+ maxMonthlyIncome);
            out.println();

            out.println ("total income estimated over the next 2 years");
            out.println();

            out.println("estimated monthly income at month 1-3 \t:"+ 0.2 * maxMonthlyIncome);
            out.println("estimated monthly income at month 3-6 \t:"+ 0.3 * maxMonthlyIncome);
            out.println("estimated monthly income at month 6-12\t:"+ 0.4 * maxMonthlyIncome);
            out.println("estimated monthly income at year  1-2 \t:"+ 0.5 * maxMonthlyIncome);
            out.println();

            out.println("wages will be 45% of total income at the end of each month" );
            out.println();

            out.println("estimated monthly wages for month 1 - 3  £ "+ 0.2 * WAGES_PCT * maxMonthlyIncome);
            out.println("estimated monthly wages for month 4 - 6  £ "+ 0.3 * WAGES_PCT * maxMonthlyIncome);
            out.println("estimated monthly wages for month 7 - 12 £ "+ 0.4 * WAGES_PCT * maxMonthlyIncome);
            out.println("estimated monthly wages after the first year £"+ 0.5 * WAGES_PCT * maxMonthlyIncome);
        }
    }
}