__Question 15 (Question on compound interest --Must try this question)__Choong started working for a company on 1 January 2008 with an initial annual salary of RM28800. Every January, the company increased his salary by 5% of the previous year’s salary. Calculate

(a) his annual salary, to the
nearest RM on 1 January 2013,

(b) the minimum value of n such
that his annual salary in the nth year will exceed RM40 000,