Table 7.

The expected total cost for $\beta =0.3$, $\rho =1.1$, 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	1410	1459	1490
2	24	882.127	966.269	1031
3	12	715.555	835.191	922.658
4	9	639.623	791.586	886.392
6	6	579.02	777.096	873.352
9	4	563.646	790.64	920.557
12	3	575.538	831.26	928.711
18	2	613.067	890.528	904.131

ETC, expected total cost.