The James Corporation specializes in manufacturing one type of desk lamp. The company allocates variable manufacturing overhead costs on the basis of machine hours. James Corp budgeted 0.60 machine hours per lamp and allocates overhead at a rate of $1.40 per machine hour. Last year it manufactured 23,000 lamps, used 161,000 machine hours and incurred actual overhead costs of $193,200. What was James Corp's variable manufacturing overhead rate variance last year?