Step 1: Calculate the current quantity demanded (Q)
Given the demand function, we can plug in the given values for $P_A$, $Y$, and $P$:
$$
Q = \frac{10 \cdot 2^2}{4}
$$
$$
Q = \frac{40}{4}
$$
$$
Q = 10
$$
So, the current quantity demanded is 10.
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