Need to apply Discounts depending on Customer Order Quantity across all the orders of that customer.

Summary:

Need to apply discounts depending on customers orders quantity. Means Customer initially orders 100 then no Discount. If he ordered 200 then total quantity(200+100=300) then apply 10% discount. For next sales order if quantity = 300(300+200+100=600) then apply 20% just like that.

Apply discounts depending on total quantity customer ordered across all the orders of that customer.

Is there any Solution for this requirement ? Appreciate your help on this.

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