A distributor sells water cooling units for \\( \\$ 810 \\) each. The operating profit is \15 on cost and markup is \65 on cost. a. Calculate the cost per cooling unit. Round to the nearest cent b. Calculate the rate of markdown offered during a sale if it made a profit of \\( \\$ 52.30 \\) per machine. \ Round to two decimal places c. What should be the rate of markdown offered to sell the machines at the cost price? \ Round to two decimal places