Question

7% de 320
15% de 640
35% de 1200

Answer 1

Regra de três

100%------> 320

7%----------> x

100x= 2.240

x= 2.240/100

x= 22,40

_________________

Regra de três

100%-------> 640

15%----------> x

100x= 9.600

x= 9.600/100

x= 96

_________________

Regra de três

100%------> 1200

35%---------> x

100x= 42.000

x= 42.000/100

x= 420

Answer 2

Resposta:

100=320

7=x

100x= 2240

x=22,4

100=640

15=x

100x=9600

x=96

100=1200

35=x

100x=42000

x=420