HELP DO IT IN EXCEL ONLY SHOW FORMULAS PLEASE!

Jennifer Bellin has been put in charge of planning her company's annual leadership conference. The dates of the conference have been determined by her company's executive team. The table that

follows contains information about the activities, predecessors, and activity times $($in days$)$:

$\backslash$table$[[.,$Activity,Predecessors,$\backslash$table$[[$Activity$],[$Time$],[($days$)]]],[$A$,\backslash$table$[[$Develop conference$],[$theme$]],,3],[$B$,$Determine attendees,,$3],[$C$,$Contract facility,A$,7],[$D$,$Choose entertainment,A$,10],[$E$,$Send announcement,B$,5],[\backslash$table$[[F$