Trent Company would like to estimate its current inventory level and has provided the following information:

Goods available for sale $$280,000$

Net sales $$320,000$

Normal gross profit as a percentage of sales $40\%$

Using the gross profit method, what is the estimated current inventory level?

a$.$ $$152,000$

b$.$ $$128,000$

c$.$ $$88,000$

d$.$ $$40,000$