| Rank | Cost (USD) | Country | % Correct |
|---|---|---|---|
| 6 | 5.15 | United States | 93%
|
| 5 | 5.25 | Canada | 85%
|
| 14 | 4.44 | United Kingdom | 85%
|
| 11 | 4.63 | Australia | 65%
|
| 2 | 6.26 | Norway | 63%
|
| 1 | 6.71 | Switzerland | 62%
|
| 4 | 5.59 | Sweden | 61%
|
| 15 | 4.43 | New Zealand | 55%
|
| 16 | 4.25 | Brazil | 50%
|
| 18 | 4.24 | Singapore | 42%
|
| 9 | 4.90 | United Arab Emirates | 42%
|
| 12 | 4.57 | Argentina | 41%
|
| 13 | 4.53 | Saudi Arabia | 37%
|
| 17 | 4.24 | Bahrain | 34%
|
| 8 | 4.95 | Israel | 32%
|
| 19 | 4.23 | Kuwait | 29%
|
| 3 | 6.08 | Uruguay | 18%
|
| 20 | 3.97 | Czech Republic | 15%
|
| 7 | 5.08 | Lebanon | 13%
|
| 21 | 3.97 | Costa Rica | 10%
|