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The coordinating conjunction in the sentence is NOR.
There are only seven coordinating conjunctions. Remember the terms FAN BOYS in relation to coordinating conjunctions.
F - for
A - and
N - nor
B - but
O - or
Y - yet
S - so
Coordinating conjunctions connect words, phrases, and clauses. Giving equal emphasis on two main clauses.
Here are the patterns for using coordinating conjunctions:
1) connecting two main clauses
main clause + coordinating conjunction + main clause
2) connecting two items
item + coordinating conjunction + item
3) connecting three or more items in a series
item + item + coordinating conjunction + item
approx. 77%
Explanation:
Assuming that there is nothing else that's calculated separately (quizzes, essays, etc.), then your grade would be a 77%. (78*90+63*10)/100 = 77