One way to find a percentage of an amount is to use 1%, 10% and 50% as building blocks. 1%, 10% and 50% can be used as building blocks for working out percentages in your head. 1% is 1⁄100.

Chart by author. 1. Calculate percentage changes. Using data in Column C, calculate the daily percentage change in the index. Starting with cell D4, the formula is the current day's closing value ...

A percentage ... of 1,250? • Calculate the ratio: 50/1,250 = 0.04, • Multiply by 100 (0.04*100), which results in 4 per cent. The other method is by multiplying: Using the same example ...