Calculate sales volume variance, flexible budget variance, and total budget variance.

Item	Amount
Budgeted sales	$1,000,000
Actual sales	$900,000
Budgeted variable costs	$600,000
Actual variable costs	$540,000
Fixed costs	$200,000
Actual fixed costs	$220,000

• Requirements:
  1. Calculate the sales volume variance.
  2. Calculate the flexible budget variance.
  3. Calculate the total budget variance.
  4. Analyze the variances and provide insights into the store's performance.