Simple Forecast

Hello, 

I need to do simple forecast based on current sale and time left to end of month. 

I have 4 short tables:
Office table
Office name | Office ID

Tate table
Date | Day of week

Sales table
Date | Office ID | Sale value

Hours when offices are open
Office ID|Day of week|Noumber of Hours

Actualy I just show sales over date perr office but I need to add forecast. 

For example:
We have 2019-03-24 - sales of current month is '150 000', offices were open 150hours in total. To end of month it is left 50hours. Soo sales per hour is (150 000/150) = 1000. So forecast will be 100*50=50 000 (+150 000). 

How too do this in power bi (dax) and how to spread this value (50k) for days between 25-31. 

I want to show on char value of sale day by day from 1-24 march and forecast from 25-31. 

Please help. (sorry for my bad english :D )