If the present value of perpetuity of ₹600 payable at the end of every six months is ₹18000, then the rate of interest is : |
$\frac{20}{3}$ % per annum $\frac{22}{3}$ % per annum $\frac{17}{3}$ % per annum $\frac{10}{3}$ % per annum |
$\frac{20}{3}$ % per annum |