Question 874185
(weight of other classwork)*(score on other classwork) + (weight of final)*(score on final) = (Final Grade)



(0.70)*(0.80) + (0.30)*(x) = (0.80)



0.56 + 0.30x = 0.80



0.30x = 0.80 - 0.56



0.30x = 0.24



x = 0.24/0.30



x = 24/30



x = 4/5



x = 0.8



So you need to get at least an <font color="red">80%</font> on the final to get an overall grade of 80% or higher. This is assuming the grade isn't curved or anything.