tolong dibantu ya,pakai cara

Kemeja = 21 + 1,5 = 22,5 lusin = 270
Celana = 7+3/4 = 7,75 kodi = 155
Kaos = 1+1/2 = 1,5 gross = 216

Jawabannya yg B

1 lusin = 12
1 kodi = 20
1 gross = 144

kemeja anak 22,5 x 12 = 270
celana anak 7,75 x 20= 155
kaos anak 1,5 x 12 x12= 216
jawaban : B