You use the single index model to estimate the expected return for firm $1.$ Alpha and Beta for firm $1,$are $1\%$ and $2,$ respectively. On May $13$th$,$ the actual return on the market was $2\%,$ and the actual return on firm $1$ was $6\%.$ The unexpected part of the firm specific return for firm $1$ on May $13$th is $1\%,$ write out the workings