You've observed the following returns on SkyNet Data Corporation's stock over the past

five years: $16$ percent, $-16$ percent, $18$ percent, $28$ percent, and $10$ percent. Suppose the

average inflation rate over this period was $2\mathrm{.}1$ percent and the average T$-$bill rate over

the period was $4\mathrm{.}2$ percent.

What was the average real risk$-$free rate over this time period? $($Do not round

intermediate calculations and enter your answer as a percent rounded to $2$ decimal

places, e$.$g$.,32\mathrm{.}16.$