Soooooooooo, I read today that the world's debt amount to $100 trillion. Wikipedia says that in 2012, the GDP was ~72 trillion. Let's suppose that it's $80 trillion now.
Debt to GDP = 125%
Incorrect. Total debt is $157 trillion in developed countries plus $66 trillion in emerging markets, because is 313% of GDP and the GDP is $72 trillion: