Answer:
Dr Material Inventory $13,020
Cr Trade Payables $13,020
Dr Work In Progress $9,742
Cr Material Inventory $9,742
Explanation:
On 7th May the double entry would be to record the inventory purchases on credit which would increase the inventory by $13,020 (620*21) as under:
Dr Material Inventory $13,020
Cr Trade Payables $13,020
The material sent to production or manufacturing team would be recorded as increase in the work in progress by the value of the material issued which is $9,742 (211*$19 + 273*$21).
Dr Work In Progress $9,742
Cr Material Inventory $9,742