The radioactive nuclei \({}^{40}\text{K}\) decay to \({}^{40}\text{Ar}\) with a half-life of \(1.25 \times 10^9\) years. The \({}^{40}\text{K}/{}^{40}\text{Ar}\) isotopic ratio for a particular rock is found to be 50. The age of the rock is \(m \times 10^7\) years. The value of \(m\) is .............. (Round off to 2 decimal places)