The word per cent means per 100. to calculate a percent of a total divide the number you were given by the total and then multiply by

The first thing you must do to solve the problem is the following rule of three:the total > 100
 the number you were given > x
 Clearing x we have:
 x = ((the number you were given) / (the total)) * (100)
 Therefore, you must multiply by 100.
 
 divide the number you were given by the total and then multiply by 100

The answer of the above question is

The answer is the first one