Q1 Q2 Q3 Q4
Sales in units      10,000     12,000     14,000     16,000
Desired finished goods in units        3,000      3,500      4,000
Total demand      13,000     15,500     18,000
Less beginning inventory       (2,500)     (3,000)     (3,500)
Finished production required      10,500     12,500     14,500
Raw material qty per unit of production              4             4             4  
Raw material required for production      42,000     50,000     58,000
Desired raw material inventory in lbs.        5,000      5,800
Total raw material required      47,000     55,800
Beginning raw material inventory       (4,200)     (5,000)
Raw material purchases required     50,800