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x - 4%
100x = 80000 /:100
x = 800
800 - 100%
y - 20%
100y = 16000 /:100
y = 160
800-160=640
20000+640=20640
Odp:Kwota po rocznym oszczedzaniu wynosi 20640 zł
x -104%
x=20000*104/100
x=20800
20800-100%
x -80%
x+20800*80/100
x=16640
x -4%
20000*4 80000
_______=_______= 800
100 100
800-100%
x -20%
800*20 16000
______=______=160
100 100
800-160=640
20000+640=20640