SQL View that SUMs columns

I have a table that has ID numbers and financial transactions that I am trying to sum together. Basically I want to turn this:-

1  |  100  |  200  |  500
2  |  200  |  400  |  800
1  |  400  |  200  |  100
3  |  100  |  200  |  100
3  |  500  |  200  |  400

into this:-

1  |  500  |  400  |  600
2  |  200  |  400  |  800
3  |  600  |  400  |  500

..using a SQL view under SQL 2005. Is this possible and can someone advise on the best way to make it happen?

Thanks