As of December 31, 2020, the expected return in 2021 for stock of Hoping-For-Vaccine (HFV), a manufacturer of passenger jet engines, is 8%. During 2021, a technological breakthrough in reducing the fuel consumption of HFV engines leads to a sudden increase of 16% in HFVs stock price. This technological breakthrough is the only unexpected news for HFV in 2021.

Question: What will be HFVs actual return in 2021? Please explain.