Arthur D. answered 12/18/15
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the 61% is worth 34%
the 100% is worth 66%
34% of 61%=0.34*61=20.74
66% of 100%=0.66*100=66
66+20.74=86.74% is your grade now and rounded off would be 87%, a B+
look at it this way...
61% is about 1/3 of your grade (33 1/3%≈34%)
100% is about 2/3 of your grade
61+100+100=261, 261/3=87%