Function sumPrices

Example

const validityPeriodsByDay = [
  {
    costPerThreshold: [
      {
        numberTravelers: 8,
        pricePerTraveler: 100,
      },
      {
        numberTravelers: 10,
        pricePerTraveler: 100,
      },
    ],
  },
  {
    costPerThreshold: [
      {
        numberTravelers: 8,
        pricePerTraveler: 100,
      },
      {
        numberTravelers: 10,
        pricePerTraveler: 100,
      },
    ],
  },
];

const result = sumPrices(validityPeriodsByDay, 8); // result = 200
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