Resposta :
Aumento:
100% + 20%= 120%
120%/100>> 1,20
1,20 × 40,00= 48,00
Desconto:
100% - 20%= 80%
80%/100>> 0,80
0,80 × 48,00= 38,40
Aumento:
100% + 20%= 120%
120%/100>> 1,20
1,20 × 40,00= 48,00
Desconto:
100% - 20%= 80%
80%/100>> 0,80
0,80 × 48,00= 38,40