Find the value of \( (1-\frac{1}{3})(1-\frac{1}{4})(1-\frac{1}{5})\ldots(1-\frac{1}{100}) \)
A man spends \(\frac{2}{5}\) of his salary on house rent, \(\frac{3}{10}\) of his salary on food and \(\frac{1}{8}\) of his salary on conveyance. If he has Rs. 1400 left with him, find his expenditure on food.