Brand B: 327*90%=294.3 (yuan) 327-294.3=32.7 (yuan)
Brand C: 415 * 75% = 311.25 (yuan) 415-31.25 =103.
D brand: 524*70%=366.8 (yuan) 524-366.8= 157.2 (yuan)
A:D brand has the largest price reduction.
In fact, we can say that there is no need to set up a column for the decline. Just look at the discount, 30% off, of course, the biggest drop. It has dropped by 30%.
If I were a customer, I would certainly start with brand D, because its original price is higher, its quality should be better than others, and its decline rate is the best. Buying now is the most affordable, so I'll choose.
There are ***27 people traveling in Xiaoming's class, so there are two choices.
1) All student tickets: 27*5= 135 (RMB)
2)20 people buy group tickets and 7 people buy student tickets.
If converted into adult 8, a ticket is 8*80%=6.4 yuan > 5 (yuan).
It is conceivable that the second method will be more expensive than the first one and can be ignored.
So they have to spend at least 135 yuan to buy tickets.