dacă notam procentul(p%) cu x atunci :
a)
[tex] \frac{120*x}{100} =36[/tex]⇒[tex]x= \frac{36*100}{120} =30[/tex] %
b)
[tex] \frac{1000*x}{100} =50[/tex]⇒[tex]x= \frac{50*100}{1000} =5[/tex] %
c)
[tex] \frac{400*x}{100} =20[/tex]⇒[tex]x= \frac{20*100}{400} =5[/tex] %
d)
[tex] \frac{500*x}{100} =50[/tex]⇒[tex]x= \frac{50*100}{500} =10[/tex] %
e)
[tex] \frac{45*x}{100} =9[/tex]⇒[tex]x= \frac{9*100}{45} =20[/tex] %
f)
[tex] \frac{240*x}{100} =12[/tex]⇒[tex]x= \frac{12*100}{100} =12[/tex] %