from where they get the results for 480*12=5760 my results is 1.9776? Help

Solution: According to Time study method the standard cycle time is calculated as follows: 1. Obtain the elemental times for each process element 2. Determine the performance rating (PR) of worker for each process element. 3. Calculate average time for each element 4. Compute normal time for each element as follows: Normal Time = NT = Element average time x PR Performance rating =105% For example, for element 1 , the average time =3.33 and performance rating is 105%, Normal time for element 1=1.81.05=1.89 minutes 5. Determine the allowance factor (A) for the complete process. Fatigue factor =20% 6. Calculate Standard time as follows: Standard time =( Total normal time )/(1A) ST=(NT)/(10.2) The times for each element are as shown below: \begin{tabular}{|c|c|c|c|c|c|c|} \hline Elements & A=30.4cm & B=16.0cm & C=24.2cm & D=11.6cm & Average Time & Normal Time \\ \hline Print information & 2.5 & 1.5 & 2.1 & 1.1 & 1.8000 & 1.8900 \\ \hline Apply self-adhesive figure & 0.24 & 0.25 & 0.25 & 0.24 & 0.2450 & 0.2573 \\ \hline Laminate & 1.12 & 0.75 & 0.98 & 0.5 & 0.8375 & 0.8794 \\ \hline Bi-fold cardboard & 0.18 & 0.17 & 0.18 & 0.18 & 0.1775 & 0.1864 \\ \hline Put on belt conveyer & 0.08 & 0.08 & 0.07 & 0.08 & 0.0775 & 0.0814 \\ \hline \multicolumn{7}{|l|}{ Total Normal Time =3.2944} \\ \hline \multicolumn{7}{|c|}{\begin{tabular}{l} ST=(NT)/(10.2)=3.2944/(10.2)=4.12 minutes per unit \\ Demand for special model =40 dozen =1240=480 units \\ Time required by 480 units =4804.12=5760 minutes =96 hours \\ If 3 employees are working on the production, \\ Time required for 480 units =96 hours /3 workers =32 hours. \end{tabular}} \\ \hline \end{tabular}