How is sales revenue calculated using gross profit percentage and cost of goods sold?

• total network inventory
• make profit online

Inventory began with 30,000 dollars. During the period the company purchased 61,000 dollars of merchandise. At the end of the period, inventory was 22,000 dollars. If the gross profit percentage was 40%, what was the sales revenue?


So i been stuck on this problem for over 30 min, i entered the wrong answer online and it provided the right answer of 115,000 dollars.


The thing is that I don't want to move on before understanding how this was calculated. Please explain in detail. Much appreciated.

How is sales revenue calculated using gross profit percentage and cost of goods sold?