Show price changes in variant

[pegi-tutu]

Hi,

 

Am struggling to figure this out, I want each variant to show what affect a change would have on the prices

 

for example:

 

XS - Price would be £200 (-£100)

S - Would be £250 - (-£50)

M - Default Product price would be £300 (-£0)

L - Price would be £350 (+£50)

XL - Would be £400 - (+£100)

 

Has any one had any experience doing this before, if so what did you do?