IF Statement Returns False When True On Certain Numbers

First time post!

I am subtracting one cell from another and putting the answer in a separate cell. Then using the answer in another I use a formula to see if the answer equals a certain value.

Eg A3-A1. Answer goes in B1. Then in C1 formula IF(B1=0.2,"TRUE","FALSE")

For some reason certain values do not work and I am completely lost for why this is happening! I use excel regularly but am no expert but this has completely stumped me. I've a horrible feeling I may look very stupid over this! Ha.

I have attached an excel sheet in case I have not explained this very well! All three examples should show TRUE but only the last one is!!

Thanks in advance!

Paul