Nngung ka,ayo bntr lg 10​

100% Hb – 10% Hb = Hj

90% Hb = Hj

90% × Hb = Rp 720.000

90/100 × Hb = Rp 720.000

9/10 × Hb = Rp 720.000

Hb = 720.000 × 10 / 9

Hb = Rp 800.000