(Originais Teachy 2023) - Question Medium of Physics

João decided to save energy in his house and replace his old electric shower with a solar system. He wants the electricity savings to be at least 75% compared to the previous consumption of the electric shower. His electric shower has a power of 4500 W and operates on average 2 hours per day. Considering a month with 30 days and a cost of R$ 0.50 per kWh, do the following: a) Calculate the amount of electricity consumed in a month by the electric shower before the installation of the solar system. b) Determine the maximum power that the shower to be purchased by João must have, in order to achieve a 75% savings compared to the consumption of the old electric shower. c) Calculate the monthly amount saved by João after the installation of the new shower, considering the cost of electricity and the power determined in item b.