Answer:
70%
Step-by-step explanation:
First find the ones that still need to be installed
270-81
189
Percent to be done = number to be installed / total
=189/270 =.7
Change to percent form = .7 *100% = 70%
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i think it is b and c im trying
5:6
the ratio before would be 10/12 so you would have to divide both sides by 2 so you would get 5/6.Hope this helped
the answer is 0.083
5