Simple Salesforce APEX class/trigger needed

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Job Description


I need to create an Apex Trigger (and an Apex class?) to transfer the results of a Custom Activity Field "Date_Brochure_sent__c" to a field on its related Lead.

The Activity Custom Field: "Date_Brochure_sent__c" is calculated using the following formula:

IF (Subject="Brochure letter sent", CreatedDate, NULL)

So I presume I need to both the appropriate Apex Trigger (and Class?) to achieve this?

Many thanks


Skills: apex,