You have 2500 square feet for selling space. You want to reserve at least 125 square feet for each product category you will carryovers 30% of the space will be used for aisles. How many categories can you carry?

You first need to find out how much usable floor space you will have.

You have 2500 feet of total space, but 30% of the space is unusable because the aisle. So you would multiply 2500 X 70%

Then you would need to figure out how many categories you can have so you would take the number of usable feet you just calculated divided by 125 (the amount of square feet each product category requires.)