What percentage earth-like planets are thought to exist within the universe?

Hint :Earth is that the third planet from the Sun and therefore the only astronomical object known to harbor life. About 29% of the surface is land consisting of continents and islands. The remaining 71% is roofed with water, mostly by oceans, seas, gulfs, and other salt water bodies, but also by lakes, rivers, and other water , which together constitute the hydrosphere.

Complete Step By Step Answer:
On November 4, 2013, astronomers reported, supported Kepler space mission data, that there might be as many as 40 billion Earth-sized planets orbiting within the habitable zones of Sun-like stars and red dwarf star stars within the Milky Way Galaxy. the closest such planet could also be 12 light-years away.
In September 2020, astronomers identified 24 super before the scientific look for and study of extrasolar planets, the likelihood was argued through philosophy and fantasy . The mediocrity principle suggests that planets like Earth should be common within the Universe, while the rare-earth element hypothesis suggests that they're extremely rare.
The thousands of exoplanetary star systems discovered thus far are profoundly different from the system , supporting the rare-earth element Hypothesis. Habitable planet (planets better than Earth) contenders, from among quite 4000 confirmed exoplanets at the present , supported astrophysical parameters, also because the explanation of known life forms on the world .

Note :
11 billion of those estimated planets could also be orbiting Sun-like stars. the closest such planet could also be 12 light-years away, consistent with the scientists. As of March 2020, a complete 55 potentially habitable exoplanets are found.