The manufacturing cost of an air-condioning unit is $544, and the full-replacement extended warranty costs $113. If the manufacturer sells 506,970 units with extended warranties and must replace 20% of them as a result, how much will the replacement costs be? (Note: Assume manufacturing costs and replacement costs are the same.) a. $55,158,336 b. $11,457,522 c. $2,129,274 d. $66,717,252