The following data for Romero Products Inc. are available:

For the Year Ended December 31 Actual Planned Difference
Sales $8,360,000 $8,200,000 $160,000
Variable costs:
Variable cost of goods sold $3,496,000 $3,280,000 $216,000
Variable selling and administrative expenses 760,000 902,000 (142,000)
Total variable costs $4,256,000 $4,182,000 $74,000
Contribution margin $4,104,000 $4,018,000 $86,000
Number of units sold 38,000 41,000
Per unit:
Sales price $220 $200
Variable cost of goods sold 92 80
Variable selling and administrative expenses 20 22

Prepare an analysis of the sales quantity and unit price factors.