After Update the Account record Active Status from "No" to "Yes" , Create a contact record. 

 

Annual Revenue to be equally shared (divided) between number of Contacts related to that Account and everytime the currency value change whenever any new contact added or removed from that particular Account . 
I had created one currency data type  " Share__c " in Contacts.

Diamond shape star pattern using apex ? 

Annual Revenue to be equally shared (divided) between number of Contacts related to that Account and everytime the currency value change whenever any new contact added or removed from that particular Account . 
I had created one currency data type  " Share__c " in Contacts.