Question

José, vecino de mi calle, me ofrece $3840 por mi computadora, con lo que ganaría el 28% del costo. Siete días después se la vendí a Rogelio, compañero de grupo, en $3750, ¿Qué porcentaje del costo gané al hacer la venta?cual el procedimiento que operaciones se realizaron

Answer 1

The first thing we must do for this case is to determine the cost.
For this, we make the following rule of three:
3840 -------------> 128%
x ------------------> 100%
Clearing x we have:
x = (100/128) * (3840)
x = 3000
We now look for the percentage earned when making the sale.
For this we make the following rule of three:
3000 -------------> 100%
3750 ------------------> x
Clearing x we have:
x = (3750/3000) * (100)
x = 125
Then, the percentage earned is:
125-100 = 25%
Answer:
I won 25% of the cost when making the sale.