Răspuns :
x- pret initial
x-10x/100=A
A-10A/100=160 / *100
100A-10A=1620
90A=16200
A=180
x-10x/100=180 / *100
100x-10x=18000
90x=18000
x=200
x-10x/100=A
A-10A/100=160 / *100
100A-10A=1620
90A=16200
A=180
x-10x/100=180 / *100
100x-10x=18000
90x=18000
x=200