Answer:
Therefore, store has marked the selling price as $100.
Explanation:
A store buys an item for $50 and marks it up 100% up means store has marked the selling price of that item twice of its cost price.
Selling price = Cost price + Profit
= Cost price + 100% of cost price
= 2 × cost price
= 2 ×50 = $100
Therefore, store has marked the selling price as $100.