Could someone explain how to do this?

 It is a very hard question the smart thing to do would be ask your teacher or fellow class mate for help.  I would say multiply .12 by 10000 and see what you come up with and then multiply that by 5. And then add that to the already 10000 you have. Not sure of the outcome for your answer. Hope this helps.

It’s hard to understand what you put.. can you show a picture ?