If tan 3θ · tan 6θ = 1, then the value of tan 30θ is:
At what rate per cent of simple interest does a sum of money double itself in 12 years?
9 \( \frac{1}{3} \) %
8 \( \frac{1}{3} \) %
8 \( \frac{2}{3} \) %
9 \( \frac{1}{3} \) %
A boy bought some toffee at the rate of 15 toffees for ₹3 and sold all of them at the rate of 3 toffee for ₹2. Find the gain or loss.
233 \( \frac{1}{3} \) % loss
233 \( \frac{2}{3} \) % loss
233 \( \frac{2}{3} \) % gain
233 \( \frac{1}{3} \)% gain