BE $6-12$ Performance obligations; construction $$ LO$6-5$ On January $1,2024,$ Lego Construction Company signed a contract to build a custom garage for a customer and received $\backslash (\backslash$$ $10,000\backslash )$ in advance for the job. The new garage will be built on the customer's land. To complete this project, Lego must first build a concrete floor, construct wooden pillars and walls, and finally install a roof. Lego normally charges stand$-$alone prices of $\backslash (\backslash$$ $3,000,\backslash$$ $4,000\backslash ),$ and $\backslash (\backslash$$ $5,000\backslash ),$ respectively, for each of these three smaller tasks if done separately. How many performance obligations exist in this contract?