$66, 36, 18, ?$

If $A = \left(\frac{1}{0.4}\right) + \left(\frac{1}{0.04}\right) + \left(\frac{1}{0.004}\right) + \dots$ up to $8$ terms,then what is the value of $A$ (in $.5$)?

$980, 484, 236, 112, 50, ?$

Find the next number in the series: $14, 15, 23, 32, 96, ?$

$13, 21, 29, 34, 43, 92, 12, ?$

Find the missing number in the series: $60, 20, ?, 15, 60, 12$.