Hotel accommodation discount

The discount rooms in five-star hotels are 850 yuan per room per night, which is one sixth cheaper than the original one. The original house price is: 850/( 1-6) = 1020 yuan.

Discounted rooms in four-star hotels are 450 yuan every night, which is 25% cheaper than before. The original house price is: 450/( 1- 25%) = 600 yuan.

How much cheaper is this room in a four-star hotel than this room in a five-star hotel per night? 1020-600=420 yuan