Question 868884
You didn't state it but I assume that a C is at least a 70(?).
{{{70=(80/100)(78)+(20/100)(T)}}}
{{{0.2T=70-62.4}}}
{{{0.2T=7.6}}}
{{{T>=38}}}
You need to get at least a 38 on the final to get at least a C.