The owner of Quick Buy a variety store has an annual revenue of $$500,000.$ Each year, they pay $$25,000$ in rent for the store, $$10,000$ in business taxes, and $$400,000$ on products to sell. The owner estimates they could put the $$100,000$ they have invested in the store into a friend's restaurant business instead and earn an annual $20\%$ profit on their funds. The owner also estimates that they and their family could earn a total annual wage of $$90,000$ if they worked somewhere other than the store. Include a minus sign $(-)$ in front of any negative values entered as a solution below.

a$.$ The total explicit costs of running the store are $

$.$

The total implicit costs of running the store are $

$.$

b$.$ The accounting profit of the variety store is $

$.$

The economic profit of the variety store is $

$.$

c$.$ The owner

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consider closing down this business because he is making a

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$.$