Zephron Music purchased inventory for $ $4,200$ and also paid a $ $380$ freight bill. Zephron Music returned $20\%$ of the goods to the seller and later took a $2\%$ purchase discount. Assume Zephron Music uses a perpetual inventory system. What is Zephron Music$\text{'}$s final cost of the inventory that it$$ kept? $($Round your answer to the nearest whole$$ number.$)$