Assume the following information for one of a company/s variable expenses: * The activity variance is 5780 favorable. - The actuit amount of the expense is 58,300 - The planned level of activity is 1,000 hours. - The actuar level of actovity is 900 hours The cost formula for this expense must be Multiple Choice 5810 pert hour $880 iper hour s7800er hour $700 per houl