Scenario 1.

1) Make two number fields on contact object
Amount_X
Amount_Y

2) Make one picklist field "Type" , values ('Positive', 'Negative')

3) Make two number fields on account
Rollup_Amount_X
Rollup_Amount_Y
Rollup_Amount

4) Make one trigger on contact object, which will do following:
--> Sum all child of contact's field "Amount_X" and store in parent account's "Rollup_Amount_X" Where Type is "Positive"
--> Sum all child of contact's field "Amount_Y" and store in parent account's "Rollup_Amount_Y" Where Type is "Negative"
--> Sum all child of contact's field "Amount_X" + "Amount_Y" and store in parent account's "Rollup_Amount"


ans on =amuraghav14@gmail.com

1) Make two DateTime fields on contact object.

LastTaskCreatedTime

LastEmailSentTime


2) Whenever a task is created on Contact LastTaskCreatedTime field should be updated.


3) Whenever you send an email LastEmailSentTime field should be updated.

4) Make trigger as bulk / Test class


Ans me on-Amuraghav14@gmail.com