Question 848572
Assuming that the 30% is all that is left to calculate of your grade:

(.78 * 70) +(1*10)+ (1*10) + (1*10) = 84.6

Perhaps you meant that each of the 100s goes in the same 10% category:

(.78 * 90) + (1*10) = 80.2

Or if neither of these options apply, you do not have enough information. It is not enough to know what your current grade is without knowing how much weight% of your final grade it is. This is why I had to make assumptions.