[tex]1 \: lusin \: buku \: BOXY +2 \: lusin \: pulpen \\ (100 - 10)\% \times 84.000) + (100 - 15)\% \times 72.000) \\ ( \frac{90}{100} \times 84.000) +( \frac{85}{100} \times 72.000) \\ 75.600 + 61.200 \\ 136.800[/tex]
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[tex]1 \: lusin \: buku \: BOXY +2 \: lusin \: pulpen \\ (100 - 10)\% \times 84.000) + (100 - 15)\% \times 72.000) \\ ( \frac{90}{100} \times 84.000) +( \frac{85}{100} \times 72.000) \\ 75.600 + 61.200 \\ 136.800[/tex]