Functions, dictionaries & while

In the last lecture from "Introduction to Python" exercise which involves the dictionaries, I tried to use the following:
I want the following code to give the total price when use call the function with the price being equal or less that the parameter. However the output should be 74 and it is give me 50, being the exact same as the lasagna. How can I change the code to give me a output in this case of 74 being all prices below or equal to the parameter 5?
prices = {
"box_of_spaghetti" : 4,
"lasagna" : 5,
"hamburger" : 2
}
quantity = {
"box_of_spaghetti" : 6,
"lasagna" : 10,
"hamburger" : 0
}
money_spent = 0

def Price_while(Price):
money_spent = 0

for item in prices:
while Price <= prices[item]:
money_spent += (prices[item] * quantity[item])
return money_spent

Price_while(5)

Output: 50