We know that the item purchased by the store cost $35 and they planned to sell it with the purpose of obtaining a profit of 50% so we can calculate what is the 50% of $35 because that is the profit that we want so: 0.5*35=17.5
So they need to sell the item for $35 + $17.5= $52.5
$52.5 is the minimum selling price that would allow them to get a profit of 50%