Answer:
$308
Step-by-step explanation:
First, you have to find out how much it costs per pound, so you would divide 231 by 21. each pound of potatoes costs $11. so 11 x 28 would make it $308.
I think 2, 8, 5 <span>those are the factors that can be divided out to simplify the multiplication problem.</span>
78 is the significant figure because in maths 0's are not considered significant. Read more into significant figures to help you out.