Question 1145609
i'm not sure what your denominations of money are.
however, assuming you are talking about rs.x, then you would do the following.


the interest rate is 21% a year compounded semi-annually.
that makes the interest rate 21/2 = 10.5% per half year = .105 per half year.


the formula is f = p * (1 + r) ^ n
f is the future value
p is the present value
r is the interest rate per time period
n = the number of time periods.


6 months is equal to one semi-annual period, therefore 9 months is equal to 1.5 semi-annual periods.


the formula of f = p * (1 + r) ^ n becomes:
f = x * (1 + .105) ^ 1.5
this becomes f = x * 1.105 ^ 1.5 which becomes:
f = x * 1.161564731.


replace x with whatever value you are talking about and that's your answer.
for example, if x = rs 1.5, then f = 1.5 * 1.161564731 = rs 1.742347097.


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