Question 1179819
.
f. Find the present values of the following annuities
i. RM6,000 every year for 8 years at 12% compounded annually
ii. RM800 every month for 2 years 5 months at 5% compounded monthly
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



I checked calculations by  @CPhill.


For calculations,  I used  MS Excel in my computer.  This software is commonly considered 
as a standard tool,  which provides the necessary precision for such calculations.


For  (i),  I got the same value,  so this part is correct.


For  (ii),  I got different value of   RM 21810.41.


In this case,  I used formula


            PV = {{{800*((1-(1+0.05/12)^(-29))/((0.05/12)))}}}.


I did not perform intermediate rounding:  it is  PROXIBITED  in such calculations
and makes big influence,  leading to incorrect answer.


I copy/pasted this my formula into  Excel spreadsheet as is and got the answer in the next instance.


The difference in our predictions is   21810.41 - 21571.39 = 239 RM.


Such a great discrepancy in Finance calculations is not allowable and is not acceptable.


Overviewing calculations by  @CPhill in many other his posts,  I concluded,
that he is irresponsible in his calculations and does not care about their precision.