Question 1187730
Strange problem, but it sounds more real-life than most math problems.
{{{x}}}= cost of a sweat-band, in $
{{{2x}}}= cost of a T-shirt, in $
{{{x+300}}}= cost of a pair of running shoes, in $
Total spent (in $) is $1380 (or maybe $1380 minus some change):
{{{3(2x)+5x+2(x+300)<=1380}}}
{{{6x+5x+2x+600<=1380}}}
{{{13x+600<=1380}}}
{{{13x<=1380-600}}}
{{{13x<=780}}}
{{{x<=780/13}}}
{{{x<=60}}}

I bet {{{x=60}}} is the price (in $) of the sweat-band, the total cost of the purchases was $1380, and the athlete expects no change. That would make the price for a T-shirt $120, and the price for a pair of running shoes $360.
Where I live, sales tax is added to the price of an item, and almost no one pays with cash. Most people pay with a credit card without touching any paper money.