Calculation of raw materials cost added to the work in process inventory account during the period:
Raw materials issued using materials requisition 1445 for Job 101 = $25,000 
Add: Raw materials issued using materials requisition 1446 for Job 102 = $35,000 
Add: Materials requisition 1447 used on multiple jobs 1= $30,000
Total raw materials cost added to the work in process inventory account during the period = $90,000