The period T of a pendulum is determined by T = 27 with L the length of the pendulum and g the gravitational acceleration. What is the approximate percentage increase of the period T if the length L of the pendulum increases by 2% and the gravitational acceleration g decreases by 0.4%? (A) 0.8%. (В) 1.2%. (C) 1.6%. (D) 2.4%.

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