The materials yield variance will be unfavourable when$\_\_\_\_\_\_\_.$

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Part $1$

A$.$

the$$ flexible$-$budget contribution margin is greater than the actual contribution margin

B$.$

actual unit sales are less than budgeted unit sales

C$.$

the$$ input$-$efficiency variance is favourable

D$.$

the actual quantity of total inputs used is greater than the flexible budget for total inputs

E$.$

the actual direct materials input mix is less expensive than the budgeted direct materials input mix