physics! HELP!

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A filament lamp-
cost- 80p
effiency- 0.2
expected life- 1000 hours

a compact fluorescent lamp (CFL)-
cost- £3.00
effiency- 0.8
expected life- 8000 hours

a filament lamp with a power rating of 100W gives 2000 units of light.
what power rating would a CFL need to provide 2000 units of light?

a)8000W
b)20W
c)25W
d025W

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