Answer and Explanation:
The computation is shown below;
1. The Standard quantity of kilogram for making 3,600 helmets is
= Number of helmets × number of kilograms required
= 3,600 × 0.65
= 2,340
2. The standard material cost is
= Standard quantity × standard price
= 2,340 × $8
= $18,720
3. Material spending variance is
= Plastic cost - standard material cost
= $20,246 - $18,720
= $1,526 unfavorable
4. The material price and quantity varaince is
Price variance
= Plastic cost - (number of plastic × cost)
= $20,246 - (2,664 × $8)
= $1,066 favorable
Quantity variance
= Standard Cost × (Actual quantity - standard quantity)
= $8 × (2,664 - 2,340)
= $2,592 unfavorable