P - Parenthesis E - Exponent M - Multiplication (left to right) D - Division (left to right) A - Addition (left to right) S - Subtraction (left to right)
So all you do is you divide 2 1/2 by .25 and you get 10 then you know one fourth or 25% of that package is 10 berries so the rest or 30% left over is 30 berries.