Sagot :
Cevap:
200
Adım adım açıklama:
Maliyete 100x desen %15 karla 115x yapar
%20 zam daha yaparsan 115x'in %20si 23x dir
115x+23x=138x
138x=276
x=2
başta maliyete 100x dedik 100×2=200
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