The following diene and dienophile can react via a Diels-Alder reaction.Draw the resonance structures that can be used to dictate the regiochemistry of this reaction. 
Definitions:
Gross Sales
The total amount of sales recorded before any deductions for returns, allowances, or discounts.
Sales Discounts
A reduction in the price of a product or service that is offered by the seller, often to prompt early payment or bulk purchases.
Sales Returns
Transactions involving the return of sold goods by customers, resulting in a reduction of revenue.
Charge Customer
The process of billing a customer for goods or services provided.
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