x -
Mamy
2000 - x*2000 = 2000*(1 - x) - cena po I obnizce
2000*(1 - x) - x*(2000*( 1 - x)) - cena po II obnizce
zatem
2000*(1 - x) - 2000*(x - x^2) = 2000*( 1 - x - x + x^2) = 2000*(x^2 -2x + 1)
2000*( x^2 -2x + 1) = 1445
x^2 -2x + 1 = 0,7225
x^2 - 2x + 0,2775 = 0
----------------------------
delta = ( -2)^2 - 4*1*0,2775 = 4 - 1,11 = 2,89
p ( delty) = 1,7
x = [ 2 - 1,7]/2 = 0,15
Odp. 15%
==============
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x -
Mamy
2000 - x*2000 = 2000*(1 - x) - cena po I obnizce
2000*(1 - x) - x*(2000*( 1 - x)) - cena po II obnizce
zatem
2000*(1 - x) - 2000*(x - x^2) = 2000*( 1 - x - x + x^2) = 2000*(x^2 -2x + 1)
2000*( x^2 -2x + 1) = 1445
x^2 -2x + 1 = 0,7225
x^2 - 2x + 0,2775 = 0
----------------------------
delta = ( -2)^2 - 4*1*0,2775 = 4 - 1,11 = 2,89
p ( delty) = 1,7
x = [ 2 - 1,7]/2 = 0,15
Odp. 15%
==============