Sound-pressure level uses $L_p=20\log_{10}(p_{\mathrm{rms}}/p_0)$. Taking the difference cancels the reference pressure:$\Delta L_p=20\log_{10}(1.5)=3.5218$ dB. Therefore **3.52 dB, A**;the 10-log expression applies to a power ratio rather than a pressure ratio.
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