The SirValiant Retail Company, which operates four stores in the DC area, budgets and analyzes power costs using the number of hours the stores are open. Specifically, the company anticipates $20,000$ kilowatt hours $($kwh$)$ per store$-$hour at a budgeted cost of $$1,000$ per store$-$hour. Stores were open for a total of $80$ store$-$hours during the week ending April $14.$ The power bill for the week indicates that SirValiant used $1$

Compute the Power Usage $($Quantity$)$ Variance for the week. If the Variance is favorable, enter the amount as a positive number; if the answer is unfavorable, enter the answer as a negative number.,$650,000$ kwh and an actual power costs of $$85,800.$