Specify the task in accordance with the logic if you do not specify the exact wording. For example, if a test result (80 correct answers and 20 incorrect), then 100 percent should be taken the amount of known quantities (80+20=100). Based on this, you can determine the percentage ratio of two quantities as 80% to 20%. And if the conditions of the problem know the number of correct answers (80) and the number of questions (100), 100 percent should take one of the known quantities, rather than their sum. Determining what value should be considered an absolute benchmark, you can go to practical result.
Find the ratio of two quantities, dividing one on another, and then multiply the result by 100 to Express this ratio in percents. If we make such calculations in mind, it is not possible, use, for example, a calculator built into the Google search engine. To do this, go to the home page of this web resource and enter the appropriate request. For example, if it is necessary to calculate the percentage of correct answers (37) of the total number (52), then type "37 / 52 * 100" and you will see the correct answer (71.1538462).
Use, for example, the spreadsheet editor of Microsoft Excel, if you want to do without the Internet. Run it, enter is used to calculate the data. For example, in the first cell, enter the number of correct answers (37) and the second the total number of responses (52). In the third cell, press the equal sign, then click the first cell, press the slash (the slash), click the second cell and press Enter. The editor will calculate a simple ratio of the two quantities. To put it in percentages, set the cell format to percent. To do this, right-click the mouse and select the context menu "Format. In the list of "number formats", click the string "Interest" and the "Number of decimal places, specify which sign is necessary to round the result. Then click "OK".