Why is it 76% and not 77%? And why not 75%? What about 79%? Do you have the slightest bit of evidence that exactly 76% of the women need to work, but not 77% or 78% of the women? You can not justify the statement "They have to work" unless 100% of them are working. (Or you could take the alternate route and simply define working as necessary, which is how some economists will occasionally treat the phrase "at the margin". But at that point, you are not saying much, other than "76% of the women need to work because that is how I have defined the word 'need' in my model.")