Table 3. Pre-surveyed WTP distribution

Amount presented (won)	Frequency (persons)	Ratio (%)	Effective ratio (%)	Cumulative ratio (%)*
0	13	8.7	8.7	8.7
1,000	4	2.7	2.7	11.3
3,000	2	1.3	1.3	12.7
5,000	18	12.0	12.0	24.7
10,000	46	30.7	30.7	55.3
12,000	1	0.7	0.7	56.0
15,000	3	2.0	2.0	58.0
20,000	14	9.3	9.3	67.3
30,000	12	8.0	8.0	75.3
50,000	13	8.7	8.7	84.0
60,000	2	1.3	1.3	85.3
100,000	13	8.7	8.7	94.0
120,000	4	2.7	2.7	96.7
500,000	4	2.7	2.7	99.3
1,000,000	1	0.7	0.7	100.0
Total	150	100.0	100.0

The cumulative ratio after excluding the value (-) that distorts the calculation result of the amount to be presented.