Explain this in detail pls (with formula)

486,000 194,400 495,800 GIVEN: BUDGETED O/H BUDGETED M/H (DRIVER) ACTUAL O/H ACTUAL M/H: JOB 110 JOB 111 JOB 112 JOB 113 39,200 29,400 68,600 58,800 196,000 JOBS 111, 112 & 113 WERE FINISHED JOB 111 WAS SOLD NOTE: DRIVER ACTIVITY AMONG JOBS CAN BE MEASURED AS FOLLOWS: JOB 110 20% JOB 111 15% JOB 112 35% JOB 113 30% TOTAL 100% REQUIRED: ANSWER COMPLETE O/H APPLIED & ACTUAL O/H SCHEDULE: APPLIED VARIANCE ACTUAL WIP 98,000 1,160 99,160 FG 318,500 3,770 322,270 COGS 73,500 870 74,370 TOTAL 490,000 5,800 495,800 REQUIRED REVISED ACTUAL O/H COMPLETE O/H APPLIED & ACTUAL O/H SCHEDULE: 477,200 WIP FG COGS TOTAL ANSWER APPLIED VARIANCE ACTUAL 98,000 (2,560) 95,440 318,500 (8,320) 310,180 73,500 (1.920) 71,580 490,000 (12,800) 477,200