The frequency of a tuning fork P is 1.5% more than the frequency of tuning fork Q and the frequency of another tuning fork R is 2.5% less than the frequency of tuning fork Q. If 8 beats are produced per second when P and R are vibrated together, then the frequency of tuning fork R is
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Beat frequency:
\[
f_b=|f_1-f_2|
\]
Always convert percentage increase/decrease into decimal form before calculation.