Răspuns :
[tex]x + \frac{20x}{100} = 24 \\ amplificam \: cu \: 100 \\ \frac{100x}{100} + \frac{20x}{100} = \frac{2400}{100} \\ 100x + 20x = 2400 \\ 120x = 2400 \\ x = \frac{2400}{120} \\ x = 20 \: lei \\ \\ verificare \\ 20 + \frac{20 \times 20}{100} = 24 \\ 20 + \frac{400}{100} = 24 \\ 20 + 4 = 24 \\ 24 = 24 \: adevarat[/tex]
24 = 100%+20%
24= 120%
120%...................24 lei
100%....................x lei
x= [tex] \frac{100 x 24}{120} [/tex]
x = [tex] \frac{2400}{120} [/tex]
x = 20 lei
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