Prestridge Corporation is a service company that measures its output by the number of customers served. The company has provided the following fixed and variable cost estimates that it uses for budgeting purposes and the actual results of operations for August Variable Fixed Element per Actual Element Customer Total for per Month Served August Revenue $4,100 $120,500 Employee salaries and wages $41,500 $1,000 $ 71,200 Travel expenses $ 500 $ 14,800 other expenses $38,900 $ 38,400 When the company prepared its planning budget at the beginning of August, it assumed that 31 customers would have been served. However, 29 customers were actually served during August The activity variance for net operating income for August would have been closest to