The spot price of silver is $$19\mathrm{.}75$ per ounce. The storage costs are proportional and equal to $2\mathrm{.}20\%$ per ounce per annum continuously compounded. Assuming that interest rates are $6\mathrm{.}35\%$ per annum for all maturities, calculate the futures price of silver for delivery in $6$ months. $($Answer with two digits decimal accuracy. Example: $17\mathrm{.}53.)$