Answer & explanation
Correct answer: option 2
$M = \frac{L - f_0 - f_e)D}{f_0 f_e} = \frac{16 - 0.4 - 2.5)\times 25}{2.5 \times 0.4} = 327.5$
Correct answer: option 2
$M = \frac{L - f_0 - f_e)D}{f_0 f_e} = \frac{16 - 0.4 - 2.5)\times 25}{2.5 \times 0.4} = 327.5$