1.) The item costs $30. Let's find the sale price. Since the item is on sale for 15 percent, you have to multiply $30 (cost) by 15 percent. $30 (0.15)= $4.50.
2.) Now, let's move on to the next part of the problem. Now, we can use the sales price for finding the sales tax. You have to multiply $4.50 (sales price from step one) by 8.2 percent (sales tax). $4.50 (0.082)= $0.369.
*Now remember: you always multiply the sales price by the sales tax, not the original price by the sales tax, unless instructed to do so*
3.) Let's round the answer to the nearest cent. $0.369 is about $0.40 (round-up).
4.) The item's final cost is about $0.4.
Hope this helped. ^^