What must be the beta of a portfolio with E(rP) = 20%, if rf = 5% and

Question:

What must be the beta of a with E(rP) = 20%, if rf = 5% and E(rM) = 15%?
Portfolio
A portfolio is a grouping of financial assets such as stocks, bonds, commodities, currencies and cash equivalents, as well as their fund counterparts, including mutual, exchange-traded and closed funds. A portfolio can also consist of non-publicly...