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Ask a practical mathematical question about calculating costs For example, I buy 200 Jin cucumber I bought it like this 10 Jin and 10 yuan on Monday Tuesday 20 jin 9.5 yuan Wednesday 10 jin 9 yuan Thursday 15 Jin 8.7 Friday 20 7 30 11 on Saturday . Buy a little every day, I want to calculate the average cost of 200 Jin. How to calculate?
In fact, what you want is a weighted average;
=(unit price 1 * quantity 1 + unit price 2 * quantity 2 +.) / (quantity 1 + quantity 2 +...)
How to calculate the cost of profit and discount in junior high school mathematics
Suppose the cost is x, the profit is a%, and the total capital is y after n years
(1+a%)^n*x=y
Since a, N and y are known, we need to solve the equation
The discount is similar, a is negative
Ask someone who is good at math to help me figure it out
Internet cafes are now doing activities, charging 100 to get 100, charging 500 to get 600, 3 yuan per hour,
Then how much is it per hour if 100 for 100?
Then how much is it per hour if you charge 500 to send 600?
It's still three dollars an hour,
It's just that if you give 100 for 100, you can spend twice as much time, which is equivalent to 1.5 yuan per hour;
It takes 1.2 times more time to punch 500 to send 600, which is equivalent to 1.36 yuan per hour
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