Please show how to calculate the flexible budget varience

Peppermint Kiss is a manufactures of candy It currently manufacturers 3 different product lines. The manager of each product line is held responsible for generating revenue and controlling costs. The following information was provided by the Chocolate Candy product line for the prior period. The Chocolate Candy product line is a(n) investment center profit center cost center If the company's material threshold is $900, how many flexible budget variances should be investigated