Answer:
$123 Unfavorable
Explanation:
Budgeted cost = $2,420 + (33 * $9) = $2,717
Actual cost = $2,840
Variance = Budgeted cost - Actual cost = $2,717 - $2,840 = $123 Unfavorable
Therefore, the activity variance for materials and supplies in August would be closest to $123 Unfavorable.