Given the following code and input, what is the final returned total cost?

Given the following code and input, what is the final returned total cost?

def twoCitySchedCost(costs):
    costs.sort(key=lambda x: x[0] - x[1])
    n = len(costs) // 2
    total = 0
    for i, cost in enumerate(costs):
        if i < n:
            total += cost[0]
        else:
            total += cost[1]
    return total

costs = [[10,20],[30,200],[400,50],[30,20]]
print(twoCitySchedCost(costs))