How to calcutate adjustment for production$-$volume variance? And how do you identify if it's favorable or unfavorable?

Champion Motors assembles and sells motor vehicles and uses standard costing. Actual data relating to April and May $2020$ are as follows:

$($Click the icon to view the data.$)$ Any production$-$volume variance is written off to cost of goods sold in the month in which it occurs.

Read the requirements. balance accounts. Label any variances as favorable $($F$)$ or unfavorable $($U$).$ If an account does not have a variance, do not select a label.$)$

April $2020$

May $2020$

$\backslash$table$[[$Revenues$,],[$Cost of goods sold:,$],[$Beginning inventory,$],[$Variable manufacturing costs,$],[$Cost of goods available for sale,$],[$Deduct ending inventory,$],[$Adjustment for production$-$volume variance,$],[$Cost of goods sold,$],[$Gross margin,$]]$