Calculate a Level $3$ "rate$/$price$"$ variance for materials given the following information:

budgeted units produced: $500$

budgeted material used in kgs: $700$

budgeted total material cost: $$9100$

actual units produced: $700$

actual material used in kgs : $1050$

actual total material cost: $$10500$

$$3150$ U

$$600U$

$$3150$ F

$$600F$

none of the listed answers are correct