Jay had $320.00. she gives 0.4 of it to ray. she gives 0.25 of it to a boy. she keeps the rest. how much does each person get

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$