$6.$ All$-$City Hardware lets all its employees buy its products at a $25\%$ discount. All$-$City marks up all its products by a minimum of $100\%$ of its cost. Arnold is a store employee who bought various tools that normally retail for $$200$ cost to All$-$City of $100)$ for $$150$ during the current year. Is Arnold taxed on the $$50$ discount? $7.$ In addition to the tools $($in #$6)$ buys a used delivery truck from All$-$ CityThe truck is worth $ $8,000,$ but All$-$ City sells it to Arnold for $ $5,000$ because he has been such a good employee through the years. Is Arnold taxed on the $ $3,000$ discount $?$