Answer q3.i can not solve it.
pl

So all those weights are diffent right?
We shouldn’t care about the number of bars because we are told to determine the cheapest one right?
So even if there are lots of bars but it doesn’t weigh much it isn’t profitable right?
So to find the how much money for 1 gram we must divide the number of grams by price right?
So

Brand A

100 divided by 1.30.
This gives us 0.0130 for one gram right?

Brand B

100 divided by 2.35
This gives us 0.0235 right?

Brand C
125 divided by 2.85 right?
This gives us 0.0228

So now we have calculated the prices for one gram for every brand right?
So clearly we can see the cheapest is Brand A which gives you one gram for 0.0130.