The company you work for produces a candy bar that sells for $0.50 per bar and costs $0.30 per bar plus a fixed cost of $100. A profit is not recognized until more than 500 candy bars are made and sold. Your manager assigns you to produce an equation that will generate a profit when 400 candy bars are sold while keeping the cost price the same. Which of the following equations for profit P will this happen given that your company makes x candy bars?