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mKL =
mKL = mAL
y-1 = -6
y = -5
B. Jika 1 lusin = 12 buah
2 lusin = 2 x 12 = 24 buah dgn harga beli = 720rb
4 rusak --> sisa 24-4 = 20 buah
harga jual = 20 x 33rb
= 660 rb
Rugi = harga jual - harga beli
= 660 - 720
= 60 rb
% rugi =
=
= 25/3 % atau 8,3%