A bakery needs to bake 10 different cakes by a certain date. Because the fines are the same for a cake that arrives late or late, the chef should minimize delays and advances to reduce costs. The following table shows the processing times for the 10 pies.

Answer the following: a) The best sequence for a common date of 90 hours. b) The best sequence for a common date of 50 hours.

\begin{tabular}{c|cccccccccc|} \hline Cake & A & B & C & D & E & F & G & H & I & J \\ \cline { 1 - 9 } Pi & 5 & 11 & 18 & 8 & 20 & 4 & 14 & 9 & 10 & 16 \\ \hline \end{tabular}