Can someone please help me write these journal entries for a company using the periodic inventory system? Thanks

Purchased $19,000 worth of inventory on account.

Sold goods on account for $21,000 and made cash sales of $18,800.

Credited customer accounts for $2,520 of merchandise returned.

Received $18,200 from customers for sales made previously on account.

Thanks for your help!!

If it is not given opening stock we onlay havr purchases and closing how will we find cost of goods sold

A company sold goods for rupees 60,000 for 5/10 n/60 how this entry will b made in perpetul and period inventory system