In Scheme

Young Bill likes to make his candy last, so he has developed the following policy: he eats half of the candy on the day 1, half of what remains on day 2, a third of what remains on day 3, and so forth (that is, on day n he eats 1 n th of what remains). (a) Write a function (candy-left daynum pieces) that calculates the amount of candy left at the end of the daynum th day. For example, (candy-left 3 100 ) should evaluate to 16.66666666.