Suppose you sell eight July $2020$ silver futures contracts this day at the last price of the day. Use Table $23\mathrm{.}1.$

a$.$

What will your profit or loss be if silver prices turn out to be $$17\mathrm{.}58$ per ounce at expiration? $($Do not round intermediate calculations and enter your answer as a positive value rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$

b$.$ What will your profit or loss be if silver prices are $$17\mathrm{.}42$ per ounce at expiration? $($Do not round intermediate calculations and enter your answer as a positive value rounded to the nearest whole number, e$.$g$.,32.)$