A store in a touristic area opens only three days a week $($Friday$,$ Saturday and Sunday$).$ Daily demand for the past three weeks given in the table below. Find the seasonal relative $($index$)$ of each day for Friday, Saturday and Sunday.

$\backslash$table$[[$Day$,$Volume,Moving Average,Seasonal Index$],[$Fri$,60,,],[$Sat$,98,,],[$Sun$,37,,],[$Fri$,57,,],[$Sat$,95,,],[$Sun$,40,,],[$Fri$,57,,],[$Sat$,92,,],[$Sun$,43,,]]$

$($Friday$,$ Saturday and Sunday$),$ and $0\mathrm{.}90$