Set this up as a proportion with the model stuff on top and actual building stuff on bottom.

. Cross multiply to get x = 780. The actual building is 780 inches. In feet that is 65.
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239.99 x 75%(75/100) ~ $180
$180 x 90%(90/100) = $162
-18-6k= 1+3k
9k=-19
k=-19/9
k=-2 and 1/9
T - ( - 10) = 9
t + 10 = 9
t = 9 - 10
t = -1
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Answer: t = -1
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