Question 820062
class average w/o final = 80%

class average(worth)+final(worth)=final(worth)
{{{83.6(0.8)+x(0.2)=80(1.00)}}}
{{{66.88+0.2x=80}}}
{{{0.2x=13.12}}}
{{{x=65.6}}}

You will need a 65.6% to keep a B average