I you are asking from yahoo answers on stocks most likely your 1000 will be zero in no time at all on stocks
A better than average return, by investing, is 10% a year. Due to ups and downs in the market, expect your 'investment' to double in 10 years.
However, if you feel like 'gambling', you can triple your 'investment' overnight, by picking the right horse or slot machine.
There;'s no one model, each stock works differently. Some make a lot, some make a little, some lose a little, some lose a lot.
There is no "mathematics" to project how much you can make. No one, nor any one thing can project one s profit.
Your profit is determined base on your cost price and your selling price if your selling price is higher, you made a profit. No one can "project" how much one can make. You buy for $1,000 and sell for $2,000 you made a proft, but that selling price is not assured, it s assumed.
Do you think stocks only move in one direction?
You are basically asking "How far away is over there?"