(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 32000 ..ooooer 15001 Stock value 1000 500 0 5 10 15 35 40 45 50 20 25 30 Time (weeks) (0) Based on the graph what is the limit of the stock values? (m) Based on the graph, what is the approximate increase in value of the stock 4 weeks after it was purchased? (m) 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)