Question

Calcule: a) 1% de 350 b) 4% de 35 c) 10% de 1400 d) 15% de 1400 e) 20% de 3450

Answer 1

Resposta:

$a) \: \: \: 1\% \: \: \: de \: \: \: 350 = 3.5 \\1\% = \frac{1}{100} = 0.01 \\ 350 \times 0.01 = 3.5 \\ \\ b) \: \: \: 4\% \: \: \: de \: \: \: 35 = 1.4 \\ 4\% = \frac{4 \div4 }{100 \div 4} = \frac{1}{25} = 0.04 \\ 35 \times 0.04 = 1.4 \\ \\ c) \: \: \: 10\% \: \: \: de \: \: \: 1400 = 140\\ 10 \% = \frac{10}{100} = \frac{1}{10} = 0.1 \\ 1400 \times 0.1 = 140 \\ \\ d) \: \: \: 15\% \: \: \: de \: \: \: 1400 =210 \\ 15\% = \frac{15 \div 5}{100 \div 5} = \frac{3}{20} = 0.15 \\ 1400 \times 0.15 = 210\\ \\ e) \: \: \: 20 \% \: \: \: de \: \: \: 3450 = \\ 20\% = 690 \frac{20}{100} = \frac{2 \div 2}{10 \div 2} = \frac{1}{5} = 0.2 \\ 3450 \times 0.2 = 690$