Write a function that has two parameters: orders and cost. Return any orders that are greater than the cost.
expensive_orders({ "a": 3000, "b": 200, "c": 1050 }, 1000)
➞ { "a": 3000, "c": 1050 }
expensive_orders({ "Gucci Fur": 24600, "Teak Dining Table": 3200, "Louis Vutton Bag": 5550, "Dolce Gabana Heels": 4000 }, 20000)
➞ { "Gucci Fur": 24600 }
expensive_orders({ "Deluxe Burger": 35, "Icecream Shake": 4, "Fries": 5 }, 40)
➞ {}
N/A