The arena’s merchandise department calculates total profit on an item using this formula: t = n(p – c) t is total profit in pounds n is the number of items sold p is the price the item is sold for c is the cost of the item for the arena to buyWork out t when n is 35, p is £10 and c is £2.50

First you look at the equation then the substitutions it gives you.All you do is simply plug in what they give you to the equation. So, t=35(10-2.50) 35x10=3500 After that you subtract 2.50 with 3500. So you would get 3497.5 ..

 I hope this helps!