gimna ini syankq addduhhh

Luas permukaan
= 2 × [ ( p × l ) + ( p × t ) + ( l × t ) ]
= 2 × [ ( 10 × 6 ) + ( 10 × 5 ) + ( 6 × 5 ) ]
= 2 × [ 60 + 50 + 30 ]
= 2 × 140
= 280 m2

Biaya pengecatan aula
= 280 m × Rp 40.000,00
= Rp 11.200.000,00

maaf oret-oretan jawabannya 6.400.000