Answer: 10%
Step-by-step explanation: 36 divided by 40 is 0.9
To find a percent, you move the decimal point two times over to the right. With that you get 90%
Then for failure rate minus 90% from 100% and get 10%
(or you can do 40-36 which is 4, then divide 4 by 40 to get 0.1, which is 10%)
My brain screwed up so this is edited... just don't mix the passed amount with the failure rate!
