What is the cost value of a bottle of mineral water in Nongfu mountain spring The cost value of large and small bottles varies from 1.2 to 3 yuan (mainly on the train) for shops outside

What is the cost value of a bottle of mineral water in Nongfu mountain spring The cost value of large and small bottles varies from 1.2 to 3 yuan (mainly on the train) for shops outside

The cost of a bottle of water is only 0.5 yuan. Plus the freight, it's about 0.75 yuan,

On May 1, 2009, Xiaohua, Xiaoying and Xiaoming made an appointment to xinlianxin supermarket to investigate the daily sales of "Nongfu mountain spring"
1. The sales of mineral water in the supermarket today is 360 yuan
2. The price of "Nongfu mountain spring" sold in the supermarket today is 1 yuan
3. The profit margin is 20%
According to your above conversation,
(1) How much is the price of each bottle of Nongfu mountain spring in the supermarket?
(2) How many bottles of Nongfu spring are sold in the supermarket today?

Price = purchase price + profit
1 + 1 * 20% = 1.2 yuan
360 / 1.2 = 300 (bottle)

If the purchase price of a commodity is 5% lower than that of the previous month, but the supermarket still sells the commodity according to the price of the previous month, and its profit margin increases by 6 percentage points, then the profit margin of the supermarket selling the commodity last month is as follows:
14%
Suppose that the purchase price of last month is a, the selling price is B, and the profit margin of last month is X,
Last month equation (B-A) △ a = x,
This month's equation (b-0.95a) △ 0.95a = x + 0.06
x=14%
There are three unknowns in the equation. How does x work out

Suppose the purchase price of last month is x and the selling price is y
（y-0.95x）/0.95x=（y-x）/x+0.06
y/19=0.06*x
y/x=1.14
1.14-1=0.14
That is the profit margin of last month

The purchase price of a commodity is 5% lower than that of last month, but the profit margin of supermarkets selling at last month's price has increased by 6 percentage points. What is the profit margin?
The purchase price of a commodity is 5% lower than that of last month. However, if the supermarket sells the product according to the price of last month, and its profit margin increases by 6 percentage points, then the profit margin of the product sold by the supermarket last month is?
That's how I calculate it
The purchase price is x and the selling price is y
（y-x）/x *(1+6%)={y-(1-0.05)x}/(1-0.05)*x
The answer is not correct. This is the question of today's national examination. Please help me to see what I did wrong

This topic can be thought of in a different direction
Suppose that the purchase price of last month is a, the selling price is B, and the profit margin of last month is X,
Last month equation (B-A) △ a = x,
This month's equation (b-0.95a) △ 0.95a = x + 0.06
x=14%
Unfortunately, I was also wrong in the exam