According to the numbers, Apple’s battered stock is one of the best bargains of all time. Since hitting a high of almost $700 last fall, shares have plummeted 37 percent, to $442, including a 12 percent drop in late January after Apple posted flat year-over-year profits, which bitterly disappointed the Street. Apple now trades at just over 10 times last year’s profits and roughly eight times Wall Street’s estimate of next year’s earnings — well below the average of the Standard & Poor’s 500-stock index. Plus, Apple is set to begin paying a dividend of $10.60 a share, well above the yield on Treasuries.