Shopper's Mart purchased the following items. Calculate the extended total after the trade discounts for each line, the invoice subtotal, and the invoice total.

$\backslash$table$[[$Quantity$,$Unit,Merchandise,Unit List,$\backslash$table$[[$Trade$],[$Discounts$]],\backslash$table$[[$Extended$],[$Total$]]],[150,$ea$.,$Blenders,$$59\mathrm{.}95,\frac{20}{15}\frac{?}{15},],[400,$ea$.,$Toasters,$$39\mathrm{.}88,\frac{20}{10}\frac{?}{10},],[18,$doz.,Coffee Mills,$$244\mathrm{.}30,\frac{30}{9}\frac{?}{7},],[12,$doz.,Juicers,$$460\mathrm{.}00,\frac{25}{10}\frac{?}{5},],[,,,$Invoice subtotal$]]$

Extra $5\frac{1}{2}\%$ volume discount on total order

Invoice total