給孩子的詩 (二手書交易資訊)

[{"sale_price":330,"disc":110,"prod_count":2,"sale_month":"202009","avg_price":165,"avg_disc":55},{"sale_price":310,"disc":104,"prod_count":2,"sale_month":"202012","avg_price":155,"avg_disc":52},{"sale_price":380,"disc":126,"prod_count":2,"sale_month":"202101","avg_price":190,"avg_disc":63},{"sale_price":150,"disc":"50","prod_count":1,"sale_month":"202102","avg_price":150,"avg_disc":50}]