What grade in the 3rd and 4th semester to get an 80% from the grade I have now

I currently have a 48% mid year grade but I need to get an 80% full year grade. In the 1st semester I had a 46% and in the second I had a 50%. What do I need in the next two semesters to get an 80% full year grade? I've tried to figure it out myself but I don't know what equation I should be using and I need some extra help
Asked Feb 17, 2016

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.