The least count of a stop watch is \( 0.5 \mathrm{~s} \). The time ...

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The least count of a stop watch is \( 0.5 \mathrm{~s} \). The time of 40 oscillations of the pendulum is found to be
\( \mathrm{P} \)
\( 40 \mathrm{~s} \). The percentage in the time period is
W
(A) \( 0.25 \% \)
(B) \( 0.5 \% \)
(C) \( 0.75 \% \)
(D) \( 1.25 \% \)
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