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$Q=0.3L^{-1}M^{\frac{1}{3}}R^\frac{2}{3}Y^{\frac{1}{2}}$

I'm asked to find both the cross-price elasticity of demand for $R$ wrt $Q$ ($1$) at current prices and cross-price elasticity of demand for $L$ wrt $Q$ ($2$) at current prices. I'm given no constants to substitute for $L,M,R$ or $Y$.

I'm using the formula CPEoD = $\frac{dQ}{dR}\frac{R}{Q}$ to solve the question.

Since everything cancels my answers are:

$1$) $\frac{2}{3}$

$2$) $-1$

Is this correct? I'm used to having the variables having substitutable constants and solving for a constant Q rather than this.

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