Question 1197648
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Hi 
How much will the building cost if it is to be 18 floors high?
$360,000 + Cost of 18 Floors:

cost of the 18 Floors:
 S = (n/2)(2a + (n-1)d)   a = 150,000  n = 18, d = 15,000

 S = (18/2)(2(150,000) + (18-1)15000)= $4,995,000

$360,000 + $4,995,000 = $5,355,000

Wish You the Best in your Studies.
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