Compute the multifactor productivity measure for each of the weeks shown for production of chocolate bars. Assume 40-hour weeks and an hourly wage of $12. Overhead is 1.5 times weekly labor cost. Material cost is $9 per pound

Week Output (Units) Workers Materials (lbs)

1 30,000 4 450

2 34,000 7 470

3 31,000 8 550

4 36,000 9 560

Week MFP (Output/Total Cost)

1 _____________

2 _____________

3 _____________

4 _____________

At first for week 1, I did 30,000 Units / (worker cost 12*40*4=1920)+(overhead cost 1.5*1920=2880)+(450*4=1800) = 4.545454 = 4.54 but it says that it's wrong. Please help.