1) Prove that the centre of mass of a uniform wire in the form of a semi-circle of radius r is at a distance 2r/pie (sorry don't know how to insert symbol) from the centre.

2) Prove that the centre of mass of a uniform semi-circular laminar of radius r is at a distance 4r/3pie from the centre.

In a FY 2/03 budget, directed projects amount per contract were $250,000. In Fy 03/04, this amount increased to $287,500. What is the amount of the increase?