Answer:
Say the weight of the body decreases by y% when taken to a depth 0.5km. \[\frac{{{\omega }_{h}}}{{{\omega }_{d}}}=\frac{{{g}_{h}}}{{{g}_{d}}}\Rightarrow \frac{\frac{100-x}{100}}{\frac{100-y}{1\,\omega }}=\frac{g\left( 1-\frac{2h}{R} \right)}{g\left( 1-\frac{d}{R} \right)}\]
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