Refer to Exercise E21-25. The commercial business segment provided services to 200 customers. The residential business segment provided services to 400 customers. Determine the average amount Sherman Company charged each type of customer for services, the average variable cost per customer, and the average contribution margin per customer, rounded to two decimal places. What caused the difference in contribution margin in the two segments?

Data from Exercises E21-25.

Sherman Company provides carpet cleaning services to commercial and residential customers. Using the data below, determine the contribution margin ratio for each business segment, rounded to two decimal places: 

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Service Revenue Variable Costs Contribution Margin Fixed Costs Operating Income Commercial $ 140,000 63,000 77,000 Residential $ 240,000 57,600 182,400 Total $ 380,000 120,600 259,400 15,000 $ 244,400