Simple interest on a certain sum is \( \frac{54}{75} \) of the sum. What is the rate of interest per annum if the value of the rate of interest per annum is half the time period (in years) of investment?
The cost price of a watch is ₹,800. A shopkeeper sells it at a gain of 3.75%. What is the selling price of the watch?
\( A = \frac{4 \div 8 \times 2}{3 + 14 \div 7} \) \( B = \frac{6 \div 2 - 4}{5 \div 15 \times 6} \)Then What is the value of A - B ?
\( \frac{2}{3} \)
\( \frac{4}{5} \)
\( \frac{7}{10} \)
\( \frac{1}{2} \)