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The masses of 200 g and 300 g are attached to the 20 cm and 70 cm marks of a light meter rod, respectively. The moment of inertia of the system about an axis passing through 50 cm mark is

A
0.15 kg m$$^2$$
B
0.036 kg m$$^2$$
C
0.3 kg m$$^2$$
D
Zero
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