3,5-20 persen × 3/8 sama caranya

3.5-0.2*3/8
=3.5-3/40
=140/40-3/40
=137/40
=3 17/40

3,5 – 20% * 3/8
= 3,5 – 20/100 * 3/8
= 3,5 – 0.075
= 3.425 atau bentuk pecahannya 137/40