I don't understand how the journal was made for the assignment below

Old School Publishing Inc. began printing operations on January 1. Jobs 301 and 302 were completed during the month, and all costs applicable to them were recorded on the related cost sheets. Jobs 303 and 304 are still in process at the end of the month, and all applicable costs except factory overhead have been recorded on the related cost sheets. In addition to the materials and labor charged directly to the jobs, $7,600 of indirect materials and $12,100 of indirect labor were used during the month. The cost sheets for the four jobs entering production during the month are as follows, in summary form:

Job 301Job 302Direct materials$10,600Direct materials$21,900Direct labor8,300Direct labor15,000Factory overhead6,557Factory overhead11,850Total$25,457Total$48,750Job 303Job 304Direct materials$23,200Direct materials$15,500Direct labor19,000Direct labor11,100Factory overheadFactory overheadRequired:

Journalize the Jan. 31 summary entries to record each of the following operations for January (one entry for each operation). Refer to the Chart of Accounts for exact wording of account titles.a. Direct and indirect materials used.b. Direct and indirect labor used.c. Factory overhead applied to all four jobs (a single overhead rate is used based on direct labor cost).d. Completion of Jobs 301 and 302.