Final answer:
To write 1.21 as a percentage, multiply it by 100. Therefore, 1.21 can be written as 121%.
Step-by-step explanation:
To write 1.21 as a percentage, you can multiply it by 100. This is because a percentage is a ratio expressed as a fraction out of 100. So, 1.21 * 100 = 121%. Therefore, 1.21 can be written as 121%.
Learn more about Writing a decimal as a percentage