A student performs an experiment to determine the Young's modulus of a wire, exactly 2m long, by Searle's method. In a particular reading, the student measures the extension in the length of the wire to be 0.8mm with an uncertainly of ±0.05mm at a load of exactly 1.0 kg. The student also measures the diameter of the wire to be 0.4mm with an uncertainly of ±0.01mm. Take g=9.8m/s2(exact). The Young's modulus obtained from the reading is?