The area of a triangle is one half the area for a rectangle because the triangle is half of a rectangle with equal base and height
420 cents for 1000 g. So 42 cents for 100 g (i crossed multiplied).
%profit=63-42/42 *100=50%
There are 2cm is the answer is this what your looking for
If you want to solve it the answer is 13...
If you want multiple ways to write that here are some:
3x4+2-1
3x4+1
12+2-1
12+1
Etcetera
