Question

7,8,9 va rog mult de toot !!!!Multumesccc!!

Answer 1

 

$\displaystyle\bf\\\textbf{Formula pentru calculul dobanzii simple este:}\\\\D=S*p*t\\unde:\\D=dobanda~primita~in~perioada~t\\S=suma~depusa~sau~capitalul~plasat\\p=procentul~anual~oferit~de~banca\\t=timpul, (perioada)~in~ani\\\\7)\\D=S*p*t\\4\,527\,000=12\,575\,000\times12\%\times t\\\\4\,527\,000=12\,575\,000\times\frac{12}{100}\times t\\\\4\,527\,000=125\,750\times12\times t\\\\t=\frac{4\,527\,000}{125\,750\times12}=\frac{4\,527\,000}{1\,509\,000}=\boxed{\bf3~ani}$

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$\displaystyle\bf\\8)\\D=S\times p\times t\\\\t=240~de~zile\approx8~luni\approx\frac{2}{3}~ani\\\\D=S\times p\times t\\\\D=75000\times3\%\times\frac{2}{3}\\\\D=75000\times\frac{3}{100}\times\frac{2}{3}\\\\D=\frac{75000\times3\times2}{100\times3}\\\\D=\frac{750\times2}{1}=750\times2\\\\\boxed{\bf~D=1500~u.m}$

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$\displaystyle\bf\\9)\\D=S\times p\times t\\t=120~de~zile\approx4~luni\approx\frac{1}{3}~ani\\\\96=5400\times p\times\frac{1}{3}\\\\p=\frac{96}{5400\times\dfrac{1}{3}}\\\\p=\frac{96}{1800}\\\\p=0,05(3)\\\\\boxed{\bf~p\approx5\%}$