find the amount of an annuity that pay P1650 at the end of each 6 months for 6 years if money is worth 10% compounded semiannually.
YOU WANT THE PRESENT VALUE OF An ORDIONARY ANNUITY FORMULA
C=1650, i=0.1/2=0.05, n=6*2=12 half years
And you should be able to take it from there :)