x-pretul initial
20% din x= 20/100* x= 1/5 * x= x/5 -scumpirea
x+x/5 =(5x+x)/5= 6x/5-noul pret
10% din 6x/5= 10/100* 6x/5= 1/10* 6x/5= 1/5* 3x/5= 3x/25 -noua scumpire
6x/5 +3x/25= (30x+3x)/25= 33x/25 -noul pret
33x/25=264
x=25*264/33
x=25*8
x=200lei -pretul initial
200/5=40lei -prima scumpire
3*200/25=3*8=24 -a a2a scumpire
40+24=64 lei cele 2 scumpiri
p% din 200=64
p/100*200=64
p/100=64/200
p=100*64/200
p=32%