How much is it to type and copy a piece of paper?

A pack of 500 sheets of A4 paper. Depending on the quality of the paper, the price ranges from 15 yuan to 30 yuan. Considering the ink consumption, equipment wear and other factors, the cost of copying a piece of A4 paper is about 4 to 7 cents.

According to the price of one copy 1 yuan, the profit rate of some copy shops is as high as 2000%, and the once all-powerful "Qingdao prawn" is ashamed to see this scene.

Printing is divided into ordinary color printing and high-quality printing of photos, usually inkjet printers. There are also laser printers, but the price is more expensive, and the price is also related to the printed materials. There are ordinary printing paper, heavy printing paper and glossy photo printing paper, which are all factors that determine the price. Ordinary 2 yuan or so, expensive 10 yuan or so.

The aspect ratio of group A paper size is √ 2: 1, and then the nearest millimeter value is rounded. A0 is defined as paper with an area of one square meter and an aspect ratio of √ 2: 1. The following paper sizes, such as A 1, A2, A3, etc. , are defined as the paper with one digit missing is folded in half along the long side and then discarded to the nearest millimeter value.

The size of group B paper is the geometric average of the same number of sheets and one less number of sheets of group A paper. Before the popularization of printers, group B paper was mostly used. Group C paper size is mainly used for envelopes.

People's Republic of China (PRC) national standard GB/T 148- 1997 "Paper size for printing, writing and drawing" is not equivalent to ISO2 16: 1975.