Answer
7$ 5\%$,
$ 21.43\%$
Work Step by Step
Of the total of 20 new authors, 15 are unsuccessful.
As a percentage , this equals $\displaystyle \frac{15}{20}\cdot 100\%=$7$ 5\%$ (of new authors)
Of the total of 70 unsuccessful authors, 15 are established.
As a percentage , this equals $\displaystyle \frac{15}{70}\cdot 100\%\approx 21.43\%$ (of unsuccessful authors)
