Question

Dupa doua cresteri consecutive de preturi, prima de 10%, a doua de 15%,un calculator costa 1265 lei. Aflati pretul initial al calculatorului.

Answer 1

pret initial Pi

pret dupa prima scumpire cu 10%  Ps1

Ps1 = Pi + 10Pi/100 = 110Pi/100

pret dupa a doua scumpire cu 15% Pf

Pf = Ps1 + 15Ps1/100 = 115Ps1/100

Pf = 115 x 110 Pi/10000 = 1265

Pi = 12650000/115 x 110 = 12650000/12650

Pi = 1000 lei