First, let's convert the weight of the trim from pounds and ounces to a single unit. There are 16 ounces in a pound, so 1 pound 4 ounces is equivalent to 1 + 4/16 = 1.25 pounds.
Next, subtract the weight of the trim from the weight of the case of tomatillos to find the weight of the usable tomatillos:
10 pounds - 1.25 pounds = 8.75 pounds.
Now, we can calculate the yield percent by dividing the weight of the usable tomatillos by the weight of the original case of tomatillos and multiplying by 100:
(8.75 pounds / 10 pounds) * 100 = 87.5%.
Since we need to truncate at the whole number, the yield percent is 87%.