(b) The value of a stock A(n) (in US $) as a function of time n (in weeks) is modelled and plotted below. The value of the stock is $700 when initially bought (i.e., week 1). 50 weeks of data are plotted (see below - data points joined with straight line segments): Change in stock value over time 3000 2500 Stock value (US $) 2000 1500 1000 500 0 0 5 10 15 20 25 30 35 40 45 50 Time (weeks) (i) Based on the graph what is the limit of the stock values? Based on the graph, what is the approximate increase in value of the stock 4 weeks after it was purchased? (iii) Comment on whether investing in stocks over the 50 week period was worth- while or not (Note: we buy stock in week 1 and sell in week 50)