On the Home tab in the Number group click the percentage symbol to apply a Percentage format. C6 C11. To find the percentage of a number you should look at the whole equal to 100 percent.
The math to determine a percentage is to divide the numerator the number on top of the fraction by the denominator the number on the bottom of the fraction then multiply the answer by 100.
In the example shown the formula in D6 is. P of number X. Simply use the forward slash as the division operator. C6 C11.