Question

ᴅᴇ ᴏ ʀᴇsᴜʟᴛᴀᴅᴏ ᴄᴏʀʀᴇᴛᴏ ᴅᴏs ᴘᴏʀᴄᴇᴛᴀɢᴇɴs ᴀʙᴀɪxᴏ

10% ᴅᴇ ʀ$ 120,00 ᴇ̇

15% ᴅᴇ s$ 100,00 ᴇ̇

20% ᴅᴇ ʀ$ 95,00 ᴇ̇

30% ᴅᴇ ʀ$ 145,00 ᴇ̇

25% ᴅᴇ ʀ$ 75,00 ᴇ̇

35% ᴅᴇ ʀ$ 100,00 ᴇ̇

45% ᴅᴇ ʀ$ 50,00 ᴇ̇

50% ᴅᴇ ʀ$ 100,00 ᴇ̇

65% ᴅᴇ ʀ$ 180,00 ᴇ̇

75% ᴅᴇ ʀ$ 15,00 ᴇ̇​

Answer 1

Explicação passo-a-passo:

Olá! Descobrir porcentagem é algo muito simples!

Vamos utilizar a famosa regra de três:

A) R$120 = 100%

X = 10

Multiplicando cruzado, fica:

120.10 = 100x

100x = 1200

x = 1200/100

x = 12.

Então, 10% de R$120 equivale a R$12.

B) R$100 = 100%

X = 15%

100x = 100.15

100x = 1500

x = 1500/100

x = R$15.

C) R$95 = 100%

X = 20%

100x = 20.95

100x = 1900

x = 1900/100

x = R$19.

D) R$145 = 100%

X = 30%

100x = 145.30

100x = 4350

x = 4350/100

x = R$43,5.

E) R$75 = 100%

X = 25%

100x = 75.25

100x = 1875

x = 1875/100

x = R$18,75.

F) R$100 = 100%

X = 35%

100x = 100.35

100x = 3500

x = 3500/100

x = R$35.

G) R$50 = 100%

X = 45%

100x = 50.45

100x = 2250

x = 2250/100

x = R$22,5.

H) R$100 = 100%

X = 50%

100x = 100x50

100x = 5000

x = 5000/100

x = R$50.

I) R$180 = 100%

X = 65%

100x = 65.180

100x = 11700

x = 11700/100

x = R$117.

J) R$15 = 100%

X = 75%

100x = 75.15

100x = 1125

x = 1125/100

x = R$11,25.

Espero ter ajudado!

Answer 2

ᴅᴇ ᴏ ʀᴇsᴜʟᴛᴀᴅᴏ ᴄᴏʀʀᴇᴛᴏ ᴅᴏs ᴘᴏʀᴄᴇnᴛᴀɢᴇɴs ᴀʙᴀɪxᴏ:

A)
10% ᴅᴇ ʀ$ 120,00 ᴇ̇
= 10/100 . 120
= 1/10 . 120
= 12

R.: R$ 12,00
____________
B)
15% ᴅᴇ R$ 100,00 ᴇ̇
= 15/100 . 100
= 15

R.: R$ 15,00
______________
C)
20% ᴅᴇ ʀ$ 95,00 ᴇ̇
= 20/100 . 95
= 2/10 (:2)/(:2) . 95
= 1/5 . 95
= 19

R.: R$ 19,00

____________

D)
30% ᴅᴇ ʀ$ 145,00 ᴇ̇

= 30/100. 145
= 3/10 . 145
= 145/10 (:5)/(:5). 3
= 29/2 . 3
= 87/2
= 43,5

R.: R$ 43,50
_____
E)
25% ᴅᴇ ʀ$ 75,00 ᴇ̇

= 25/100 (:25)/(:25) . 75
= 1/4 . 75
= 75/4
= 18,75

R.: R$ 18,75
____________

F)
35% ᴅᴇ ʀ$ 100,00 ᴇ̇

= 35/100 . 100
= 35

R.: R$ 35,00
_____________

G)
45% ᴅᴇ ʀ$ 50,00 ᴇ̇

= 45/100 (:5)/(:5) . 50
= 9/20 . 50
= 9 . 5/2
= 45/2
= 22,50

R.: R$ 22,50

___________
H)
50% ᴅᴇ ʀ$ 100,00 ᴇ̇
= 50/100 . 100
= 100/100 . 50
= 50

R.: R$ 50,00
____________
I)
65% ᴅᴇ ʀ$ 180,00 ᴇ̇
= 65/100 (:5)/(:5). 180
= 13/20 . 180
= 18/2 . 13
= 9.13
= 117

R.: R$ 117,00

________________
J)
75% ᴅᴇ ʀ$ 15,00 ᴇ̇​
= 75/100 (:25)/(:25). 15
= 3/4 . 15
= 45/4
= 11,25

R.: R$ 11,25