Physics Current Electricity Level: High School

A 21.0 W energy efficient fluorescent lamp is designed to produce the same illumination as a standard 50.0 W lamp.

a) How much energy does this lamp save during 80.0 h of use?> answer in units of J.

b) If electric energy does cost $0.80/kW-h, how much money is saved in 80.00 h? Answer in units of dollars.