Question

Calcule da porcentagens respectivas do valores apresentados :
a)75% de 1245           b)23% de 89

Answer 1

Regra de 3
a)
1245-----100%
x---------75%
100x= 1245.75
x= 933,75
b)
89---100%
x-----23%
100x=23.89
x=20,47

Answer 2

75% de 1245 =
75/100 . 1245 = (1245 : 100).75 = 12,45 . 75 = 933,75

23% de 89 =
23/100 . 89 = (89 : 100) . 23= 0,89 . 23 = 20.47