Quantity I: A purse contains 4 one-rupee coins, 5 two-rupees coins, and 3 five-rupees coins. The probability of picking two coins of the same denomination from the purse at random and without replacement is 'A'. Find the value of '99A + 1.5'. Quantity II: 7 employees convene at an office seminar, and each participant shakes hands with every other participant exactly once. Determine the total number of handshakes that occurred during the seminar.