Hayeraft Inc. manufactures fitted bed sheets. For March 2020, it budgeted to purchase and use 12 bolts of cloth, each 300 yards. Each bolt of cloth cost $1,500. Actual purchases and usage for March 2020 were 14 bolts of cloth at $1,420 per bolt. Hayeraft Inc. budgeted for 1,200 sheets. Actual output was 1,350 sheets.

Compute the flexible budget variance. ( please provide so detail working as i dont understand this one)