p = pretul initial
p-p*1/100 = p-p/10 = 9p/10 = pretul dupa prima reducere
pretul dupa a doua reducere = 9p/10-(9p/10)*(10/100) = 9p/10-(9p/10)*(1/10) =
= (90p/10)-9p/100 = 810000 ; numitor comun 100
90p-9p = 81000000 ; 81p = 81000000 ; p = 81000000/81 = 1000000 lei