Is this stock halal? Don't understand how to translate debt-equity ratio

Salam,

I was looking at Yahoo is part of the Yahoo family of brands , their activities seem mostly halal but I’m not sure how do I translate
Total debt/equity (mrq) 91.2

Is this in the acceptable range?

50% debt to market cap (i.e. mortgage to current property value)
100% debt to equity (i.e. you put down $1 and borrowed $1)