Concept:Profit is calculated as a percentage of cost price, so sales price is the sum of cost and profit.Explanation:Let the cost price be C.A profit of 25% on cost means profit =0.25C.Therefore, sales =C+0.25C=1.25C.Given sales =$300,000, we write 1.25C=300,000.Solving for cost: C=1.25300,000=$240,000.Profit =0.25×240,000=$60,000.Thus, the profit on sales of $300,000 is $60,000.Answer:$60,000, which is option B.