local cars = {}

-- returns the amount of working cars produced by the assembly line every hour
function cars.calculate_working_cars_per_hour(production_rate, success_rate)
  -- calculate_working_cars_per_hour body
end

-- returns the amount of working cars produced by the assembly line every minute
function cars.calculate_working_cars_per_minute(production_rate, success_rate)
  -- calculate_working_cars_per_minute body
end

-- returns the cost of producing the given number of cars
function cars.calculate_cost(cars_count)
  -- calculate_cost body
end

return cars