Answer:
1/32
Explanation:
So we know that green shirts can be represented by 1/4 of 1/8. It's 1/4 of the 1/8 of shirts in the store. The key word here is "of," which means multiplication.
So you can replace 1/4 of 1/8 with:

To multiply fractions, it's really simple: multiply the denominator with the denominator and the numerator with the numerator.

So 1/32 of the entire store is green shirts.