Question

Me ajudem









calcule as porcentagens (passo a passo) :

(a) 0,2% de 225

(b) 2,5% de 325

(c) 75% de 520

(d) 110% de 2450

(e) 31,5% de 500

( f ) 10% de 420

Answer 1

OI

Regra de Três, multiplique em cruz.

a) 0,2% de 225

100-------225

0,2%-----x

100.x=0,2.225

100x=45

x = 45/100

x = 0,45

b) 2,5% de 325

100%----------325

2,5%----------x

100.x = 2,5.325

100x = 812,5

x=812,5/100

x=8,125

c) 75% de 520

100%----------520

75%------------x

100.x=75.520

100x=39.000

x = 39.000/100

x=390

d) 110% de 2450

100%-------2450

110%--------x

100.x=110.2450

100x=269.500

x=269.500/100

x=2.695

e) 31,5% de 500

100%----------500

31,5%----------x

100.x=31,5.500

100x=15.750

x=15.750/100

x=157,5

f) 10% de 420

100%---------420

10%------------x

100.x=10.420

100x = 4200

x=4200/10

x=420

Espero ter ajudado.