Want to know how we calculate Percentage of any Quantity of numbers let me know please...?
The first thing you should do is learn the definition of "percentage"- it means a hundredth, a fraction with 100 in the denominator- though since the denominator is always 100 you only write the numerator. To find what percentage A is of Q, first find what fraction it is: divide A by Q. Then, because you want 100 in the denominator, multiply and divide by 100.
To find what fraction 71 is or 355, divide 71 by 355: . Now multiply and divide by 100: . Finally, since the "100 in the denominator" is understood for a percentage, write it as 20%.
Going the other way, to find, say, 30% of 500, remember that 30% means multiply by : .