12 per 25 : 0,8 + 12% × 1,6

12per25 : 0,8 + 12% x 1,6
= 12per25 : 4per5 + 12/100 x 8/5
=12per25 : 4per5 + 3/25 x 8/5
=12/25 x 5/4 + 24/125
=15/25 + 24/125
=3/5 + 24/125
=99/125

Maaf ya kalau salah