Question

22. Calcule mentalmente.
a) 50% de R$ 620,00
b) 25% de R$ 480,00
c) 10% de R$ 2.300,00
d) 30% de R$ 800,00​

Answer 1

Oi...

22) Calcule mentalmente.

a) 50% de R$ 620,00

100x = 50.620

100x = 31000

x = 31000/100

x = 310,00

b) 25% de R$ 480,00

100x = 25.480

100x = 12000

x = 12000/100

x = 120,00

c) 10% de R$ 2.300,00

100x = 10.2300

100x = 23000

x = 23000/100

x = 230,00

d) 30% de R$ 800,00​

100x = 30.800

100x = 24000

x = 24000/100

x = 240,00

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