27 unit cubes are packed together to create this 3x3x3 cube. Each face of a unit cube has an area of 1. If all of the corner cubes are removed, by how much will the
surface area of the figure increase?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?