tolong jawab pertanyaan saya beserta caranya

Tari = (100-12-13-20-10-30)%
Tari = 15%
Tari = 15/100 × 200
Tari = 30 orang

tari= 100%-(12+20+13+10+30)
= 100%-85%
= 15%

15%
----- × 200 = 30 siswa
100%