Sos matematica

145 = x+0,22x = 1,22x

x = 145/1,22 = 118,85 €

aliquota IVA = 100*(5,60-5)/5 = 12%

445)

Aliquota IVA $\small = 100\left(\dfrac{5,60}{5}-1\right) = 12\%.$

446)

Costi:

$\small C= \dfrac{11430}{1+\dfrac{27}{100}}$

$\small C= \dfrac{11430}{1,27}$

$\small C= 9000$ €.

Guadagno percentuale:

$\small = 100\left(1-\dfrac{9000}{11430-430}\right)$

$\small = 100\left(1-\dfrac{9000}{11000}\right) \approx{18,18}\%.$

447)

Prezzo di vendita dopo i due sconti consecutivi:

$\small PV= 650\left(1-\dfrac{12}{100}\right)\left(1-\dfrac{12}{100}\right)$

$\small PV= 650\left(1-\dfrac{12}{100}\right)^2$

$\small PV= 650×0,7744 = 503,36\,$ €.

Percentuale di sconto totale:

$\small S= 100\left(1-\dfrac{503,36}{650}\right) $

$\small S= 100×0,2256 = 22,56\%. $