Let's define variables:
x1: Friend 1 contribution for the business
x2: Friend 2 contribution for the business
x3: Friend 3 contribution for the business
The total contribution is:

The percentage that each one contributes is given by:

Where,
i = 1, 2, 3
Calculating we have:

Thus, the profit of each one is:
Calculating we have:
Answer:
To each corresponds:
571.43, 400, 228.57
Respectively