Table 2.

The expected total cost for $\beta =0.4$, usage rate (u) = 500 and.$\alpha =0.1,0.3,0.5$.

τ (months)	$k$	ETC ($)
		$\alpha =0.1$	$\alpha =0.3$	$\alpha =0.5$
1	36	1372	1428	1452
2	24	840.361	925.01	982.919
3	12	669.538	788.058	874.655
4	9	589.609	742.491	843.158
6	6	521.907	731.939	823.748
9	4	498.537	745.394	883.052
12	3	505.626	778.024	920.612
18	2	651.268	898.54	904.144

ETC, expected total cost.