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3 x 100W = 300 W

4 x 75 W = 300 W

3 x 60 W = 180 W

4 x 25 W = 100 W

Total = 880 W

Power = E x I

I = Power / E = 880 / 120 = 71/3Amp

Assuming:

-- All bulbs are in parallel across the 120V

-- Every bulb is dissipating exactly its rated power

-- Power factor on the line is 1.0

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