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- jacob sLv 72 months agoFavorite Answer
K = √s(s-a)(s-b)(s-c) where s = (1/2) (a + b + c )
s= (1/2)(100 + 50 +75) = 112.5
K = √s(s-a)(s-b)(s-c)
K = √112.5(112.5 -100)(112.5 -50)(112.5 - 75) = 1815.46
1815.46 x $ 3.00 = $. 5446.38