Jaime borrowed $2 from Alba. Jaime realized that Alba had previously borrowed $10 from him and asked her to return it back so he could buy a soccer ball that costs $12. Alba is happy to pay him the money back but tells Jaime that even if she paid him back right now, he will be short $4 from buying the ball.

Who is correct, Jaime and or Alba? Please use a number sentence (like 1 + 1 = 2 or -1 + -1 = -2) as part of your evidence