A 1-unit increase in $X$ is associated with a $\beta_1$ unit increase in $Y$.

A 1-unit increase in $X$ is associated with a $(e^{\beta_1}-1) \times 100\%$ change in $Y$.

A 1% increase in $X$ is associated with a $\beta_1\%$ increase in $Y$.

$\beta_1$ is the elasticity of $X$ with respect to $Y$.