Question

O banca acorda dobanda de 12% pe an.Ce suma de bani a depus initial Alexandra daca dupa un an are in cont 3136 lei?

Answer 1

100% + 12% : 100 = 1,12
3136 : 1,12 = 2800 lei a depus initial
2800 * 12/100 = 336 lei dobanda
2800 + 336 = 3136 lei

Answer 2

x = suma initiala 
[tex]x\cdot\frac{112}{100}=3136(lei)\;\;\rightarrow\;\;x=\frac{3136\cdot100}{112}=2800(lei)\\ \\ Verificare: 2800\cdot\frac{12}{100}=336lei; 2800+336=3136\,lei[/tex]