The word per cent means per 100. Select the cell containing the number of which you want to find 10. A percentage is just a special kind of fraction.
To find the percentage of a number you should look at the whole equal to 100 percent.
Find P percent of X. Decimal form If the number is given in decimal format it is easy to find the percentage. If B is 75 and C is 69 enter C2B2 in column D to get 92. For a given year I would expect something like.