Let the normal work wage for a week be N. Lyn receives 17.5% holiday load on 4 week normal wage.
The total amount that she receives in a week is N + N*17.5/100 = 1.175N
The total amount received by her for 4 weeks was $2350
1.175N = 2350/4
=> 1.175N = 587.5
=> N = 587.5/1.175
=> N = 500
Her normal week wage was $500