How do you break it down when 350 goes in to 3500 how do you break it down to show how you got the answer ​

If you could answer these your a life saver

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Astore sells 4 apples for $3 and 3 oranges for $4 if pete buys 12 apples and 12 oranges how much will it cost