You purchased 150 ft. of chain that normally sells for $0.15 per inch. You were charged $22.50 for the sale. Was the price correct? If not, what is the correct price and what mistake was made?

2 answers

150 * 12 = 1,800 inches

1,800 * 0.15 = $270.00

If your figures in the problem are correct, the store undercharged you by a lot.
Don't cheat, figure out on your own.