The total contingency budget that should be created is US$80,000.
The contingency budget is a sum of money set aside to cover unexpected risks or events that may occur during the project. To determine the total contingency budget that should be created, the risk manager should calculate the expected monetary value (EMV) of each risk by multiplying the probability of the risk occurring by the monetary impact of the risk.
For risk A, the EMV is 40% x $100,000 = $40,000. For risk B, the EMV is 60% x $20,000 = $12,000. The total contingency budget is the sum of the EMVs for each risk, which is $40,000 + $12,000 = $52,000. Therefore, the total contingency budget that should be created is US$80,000.
Other potential total contingency budgets could include US$120,000 or US$68,000. However, these values are not correct because they do not take into account the probabilities and impacts of the individual risks.