Seems like a WACC calculation but unsure what to do with the debt beta of 0.08 Is it necessary to unlever the equity beta and used an unlevered beta instead?

Part B Case Study Your firm is planning to invest in a new electrostatic power generation system. Electrostat Inc is a firm that specializes in this business. Electrostat has a stock price of $25 per share with 16 million share outstanding. Electrostat's equity beta is 1.18. It also has $220 million in debt outstanding with a deb beta of 0.03. The risk-free rate is 3%, and the market risk premium is 6%, You are Reguired to estimate Electrostat's cost of capital for electrostatic power generators Show all working and steps in the process. 1