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= (5x2 +6xK + 7x6 + 8x10 + 9x6 + 3x10) / 2+K+6+10+6+3 = 7,8
= (10 + 6K + 42 + 80 + 54 + 30) / 27 + K = 7,8
= 216 +6K / 27 + K = 7,8
= 216 + 6K = 210,6 + 7,8K
= 216 - 210,6 = 7,8K - 6K
= 5,4 = 1,8 K
= K = 5,4 / 1,8 = 3
Jadi, K = 3
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