I am reading all over the media this recent claim from Frank Field
that tax credits discriminate against couples because a single parent
who works 16 hours a week will get £487/week income after tax credits.

Could some kind soul please explain how this was worked out? I know
plenty of low paid people on tax credits, and none of them get
anything like this - most get around £95/week or so plus meagre take
home pay. I have tried to find the calculations they used to come to
this conclusion, but all the media articles I found simply state the
claim and do not break down the figures.

Thanks.