Suppose you invest $10,000 in Long term bonds (mean =.080 and standard deviation .040), how likely is it that you will end up losing $200 for the

Suppose you invest $10,000 in Long term bonds (mean =.080 and standard deviation .040), how likely is it that you will end up losing $200 for the year?

The question is related to "Normal Distribution, calculating z scores". I know the answer, however need assistance with how to get to the answer, so please provide detailed workings and explanation, along with the answer, so that I could gain complete understanding. Thanks.