(Solution) - Write the code for the following triggers following the style -(2025 Original AI-Free Solution)

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Write the code for the following triggers following the style shown in the text.
a. When adding a customer, add the customer?s balance times the sales rep?s commission rate to the commission for the corresponding sales rep.
b. When updating a customer, add the difference between the new balance and the old balance multiplied by the sales rep?s commission rate to the commission for the corresponding sales rep.
c. When deleting a customer, subtract the balance multiplied by the sales rep?s commission rate from the commission for the corresponding sales rep.