How to calculate total interest that you will earn annually on simple interest basis?

P × r × t
principal multiplie by rate then multiplied by time

0.167 is rational since either

scenario A) 0.167 terminates meaning it's equal to 167/1000

OR

scenario B) 0.167 is a rounded version of 0.166666666 which means it's equal to 1/6

Either way, 0.167 is rational



2/9 is rational since it is a fraction of whole numbers



π (or "pi") is irrational because we cannot write this as a fraction of whole numbers



Because 225−−−√=15=151 tells us that 225−−−√ is rational.  

Hope this is what your looking for!!