Final answer:
The materials quantity variance for Bubba's operations is $370 unfavorable.
Step-by-step explanation:
The materials quantity variance for Bubba's operations can be calculated using the formula: (Actual Quantity - Standard Quantity) x Standard Price. In this case, the actual quantity used is 5,350 pounds and the standard quantity is 5,250 pounds.
The standard price is $3.70 per pound. Plugging in these values, we get:
(5350 - 5250) x 3.70 = 100 x 3.70 = $370.
Therefore, the materials quantity variance for Bubba's operations is $370 unfavorable.