(0,48:0,5) – (20%x5/20)

(0,48 ÷ 0,5) – (20% × 5/20)
= (48/100 ÷ 5/10) – (20/100 × 5/20)
= (48/100 × 10/5) – 100/2000
= 480/500 – 1/20
= 48/50 – 1/20
= 96/100 – 5/100
= 91/100
= 0,91

=(48/100 x 10/5) – (20/100 x 5/20)
= 480/500 – 100/2000
= 48/50 – 1/20
= 91/100
= 0,91