Sagot :
Silgi=x
Kalem=2x
X+2x=750
3x=750
X=250
eski fiyatı Silgi=250
eski fiyatı Kalem=500
yeni fiyatı Silgi=250x20/100=300
yeni fiyatı Kalem=500x10/100=550
yeni kalem ve silgi fiyatı toplamı
300+550=850
s+k=750
2x kalem
x silgi
750/3x = 250
silgi 250 kr.
kalem= 500 kr
kalem %10 arttırlırsa:
500.1/10 = 50
500+50=550
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