$\backslash$table$[[$Activity$,$Predecessor,$\backslash$table$[[$Duration$],[($Months$)]],\backslash$table$[[$Cost per$],[$Activity $($Rands$)]]],[$A$,-,1,$R$20000],[$B$,-,2,$R$80000],[$C$,$Start $2$ days after finish of A$,3,$R$30000],[$D$,$A; B$,1,$R$15000],[$E$,$B$,6,$R$140000],[$F$,$D; E$,3,$R$60000]]$

$\backslash$table$[[$G$,$C$,4,$R$90000],[$H$,$G$,10,$R$120000],[$I$,$F$,3,$R$30000],[$J$,$E$,4,$R$30000]]$

Overhead $($O$.$H$.)$ cost for the project amounts to R$10000$ per month.

Draw the precedence diagram from A to J

a$.$ Determine the critical path

b$.$ determine the duration or the project, overhead cost, sum of the activity cost and the total cost of the project

c$.$ Calculate the total float and free float for each of the activities in the precedence diagram

Please explain each step like you explaining it to a $5$ year old