Hello! The answer that you are looking for is D: (-1, -1). Hope this helps!
P.S.
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Answer:
= 18
Step-by-step explanation:
= 
Cross multiply
5 * c = 30 * 3
5c = 90
Divide both sides by 5
c = 90/5
c = 18
It is $81.00, $2700 * .03 = 81