Question

Ce suma am depus la banca,cu dobanda de 30% pe an,daca dupa un an am depus 195.000 lei.



Ofer 15 puncte!

Answer 1

Notam suma initiala = x
x + 30% x = 195000
x + 30/100 * x = 195000
x + 3/10 * x = 195000
x(1 + 3/10) = 195000
x(10/10 + 3/10) = 195000
x * 13/10 = 195000
x = 195000 : 13/10 = 195000 x 10/13
x = 150000, deci suma initiala a fost de 150000 lei

Sau:
195000..........130%
x......................100%

x = 195000 *100/130 = 150000 lei

Answer 2

x + 30%x = 195000

x + 0.3x = 195000

1.3x = 195000

x = 195000/1.3

x = 150000 lei