if a country's debt-to-GDP ratio is currently 20% and its debt is expected to grow from $15 trillion to $25 trillion in the next 15 years, what will the country's GDP have to be in 15 years to maintain the current debt-to-GDP ratio?

A. $75 trillion
B. $3 trillion
C. $5 trillion
D. $125 trillion

please show me how to do this also :)

Q&A Education