Rounded to the nearest ten pence
If the one place is 5 and above, round up
If the one place is less than 5, then round down.
So
T shirts 453.56 = 450
Hoodies 679.84 = 680
Bottle openers 550.45 = 550
Key rings 22.21 = 20
Posters 86.45 = 90
Books 14.99 = 10