Problem $12-10$ Calculating Real Returns and Risk Premiums $[$LO$1]$

You've observed the following returns on Pine Computer's stock over the past five years: $11$ percent, $-11$ percent, $18$ percent, $23$ percent, and $10$ percent. Suppose the average inflation rate over this period was $2$ percent and the average T$-$bill rate over the period was $3\mathrm{.}1$ percent.

a$.$ What was the average real return on the company's stock? $($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

b$.$ What was the average nominal risk premium on the company's stock? $($Do not round intermediate calculations and enter your answer as a percent rounded to $1$ decimal place, e$.$g$.,32\mathrm{.}1.)$

Answer is complete but not entirely correct.

$\backslash$table$[[$a$.$ Average real return,$8\mathrm{.}20,\%$