SUMIF for Power BI - Newbie question

Hi,

I have two tables with id's that can be linked.

On table 1, I have one unqiue ID per row. On table 2 I have a varying amount of rows per ID:

Table 1 Table 2

 ID        ID Profit/Loss

188       188 £2.56

189       188 £123.54

In table two, each row has a column providing £ value which I need to sum to give a total per ID in table 1. I am trying to use a calculated column in table 1 to do this but can't get a DAX formula to work - bound to me being new to Power BI and DAX formula.

Can anyone provide some help here?