Given R1 = 10Ω, R2 = 20Ω, R3 = 30Ω, R4 = 40Ω, and P1 = 100W, P2 = 200W, P3 = 300W, P4 = 400W, find the input voltage and input current, if power consumed by each resistor is as given.
a) Input voltage: 100V, Input current: 1A
b) Input voltage: 200V, Input current: 2A
c) Input voltage: 300V, Input current: 3A
d) Input voltage: 400V, Input current: 4A

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