Question 547888
example: 100 points for class
80 for everything before final exam and 20 for exam 
.84(80)=67.2
.6(20)=12
if you get a 0% on the test its 67.2/100=67.2%
if you get a 60% on the test its(67.2+12)/100=79.2%
if you get a 100% on the test its (67.2+20)/100=87.2%