Please do journal entries :

$03-$Jan purchased $$10,000$ worth of inventory on account. Invoice is $2\%10,$ net $30$

$08-$Jan Paid off the $$10,000$ Invoice

$10-$ Jan had a sale of $$6,000.$ The customer put it on account. Invoice is $2\%10,$ net $30$

$10-$Jan The cost of goods was $$4,500$

$17-$Jan Customer sent back $$500$ of defective product.

$25-$Jan Customer paid his invoice.