If i end the year with a 83 for my quarterly grades totaled, & i get a 68 on the midterm, wat will it become?

so if i total all my grades up at the end of the year for each quarter, and it is an 86, and my grade on the midterm was a 68, what will that turn my grade into? if the midterm is 10%... so if you get a 0, it drops 10 points. and what would i need to get on the final to bring it up?