Predicting Economics Unit 3/4 Study Score

[timrd]

At the moment, my current sac scores are:

67% - 40% of Unit 3 (Sac 1)
98% - 30% of Unit 3 (Sac 2)
90% - 30% of Unit 3 (Sac 3)

and still two two sacs left:
?% - 50% of Unit 4
?% - 50% of Unit 4

If I would to maintain the current scores that I've gotten on my most recent sacs, what would be the estimated study score I could get?
Also what would be the mark of Unit 3? A? B+?

Cheers