jawaban beserta cara ya plzz

( 2 lusin = 12 x 2 = 24 buah )
harga  2 lusin buku = 76.800
harga eceran = 4.000 x 24 = 96.000

MENGALAMI KEUNTUNGAN

% untung = ( HJ - HB ) : HB x 100%
                 = ( 96.000 - 76.800 ) : 76.800 x 100%
                 = 25%

----- MAAP KALO SALAH HUHU :(

2 lusin = 2×12 = 24
harga jual = 24 × Rp.4.000 = Rp.96.000
untung = Rp.96.000 - Rp.76.800 = Rp.19.200

persentase untung = 19200/76800 × 100% = 1/4 × 100% = 25%