Person A is planning to organize a party with his friends. Since they have a tight budget, Person A has assigned specific tasks (related to renting party equipment) to his friends Person B, Person C, Person D and Person E. Person B and Person D were unable to get quotations for the confetti cannon and bubble machine respectively. The table below shows the quotations (in USD) each friend has obtained for each item. Bouncy Castle Helium Tank Confetti Cannon Bubble Machine Person B 500 500 Person C 700 400 200 Person D 900 300 500 Person E 700 200 600 200 300 - 700 Help Person A decide which of his friends should rent which equipment, and how much it will cost. Person A is only interested in the optimal combination.