£4000 is invested at 1.5% compound interest.(a) Show that the value of the investment after 2 years is £4120.90(2)(b) In the third year the interest rate falls to 1.4%In the fourth year the interest rate falls to 1.35%Will the interest for year 4 be more or less than the interest for year 3?Tick a box. MoreLessYou must show your working.