. >> reporter: walter burns bought some eye drops at the checkout for 11.99.e was offered a $4 off coupon at the checkout. he realized later he was charged a sales tax. he wondered if that was right. apparently if it's a store coupon, the sales tax is based on the discounted price. it was a manufacturer coupon, and we've got an image right here and there is fine print at the bottom and it says, yes, the customer pays any sales tax. so yes, he paid the correct sales tax. if you have a consumer question, let us know, 1-888-996-tips or nbcbayarea.com/responds. >> read the fine print. >>> big bold numbers when it comes to the weather department, especially this week. >> three-digit numbers on the forecast, and i know that is not what we want to hear because it's been such a hot summer. it looks like it continues, unfortunately, and at least today we can enjoy some time outside before those temperatures get unbearable. right now as we take a live look outside in heelsburg, it is 66 degrees. beautiful there. we still have the clouds in san francisco as we take a loo