Melanie buys a carrying case for her new laptop, which costs 125% as much as her old laptop case. The price of her new laptop carrying case is $65. If n represents the cost of her old laptop carrying case, which proportion can be used to find n?

Answer:
C
Step-by-step explanation:
Because don't know old laptop cost.
So 65 dollars represent 100% and n(old case) represents 125%.