Help to figure out crit formula pls

So let say I have 200 dmg from spell 40% crit chance (in tooltip) and 250 crit multi from passive/gear

how work base crit multi?

formula says: dmg*crit chance*(0.5+crit multi)

so I assume 0.5 is corispond to 150% base crit multi

Therefore for 200 dmg spell

200*40*(0.5+250/100)=2400??? (make no sence for me xD)

what I miss pls could some one explain.

or it work like 200*(1+((40/100)*(0.5+250/100))=440?

200 your non crit dmg
200x(1,5+2,5)= 800 <- your crit dmg

Dps= (0,6x200 + 0,4x200x(1,5+2,5))x casts per second

Tooltip dps already calculates criticals into it, you will have to use the average dmg/hit in character panel if you want to calculate it manually