When the gold ornaments of Fengxiang brand are replaced with new ones, the depreciation fee per gram of 7 yuan should be paid, minus the loss of 1%, plus 20% of new gold, and the cost of production will go up by 20%. If the old jewelry exceeds 1 year, the service fee of 20 yuan/gram will be charged when it is replaced. Lao Fengxiang's gold trade-in. For new gold ornaments sold by non-Lao Fengxiang, a handling fee of 40 yuan/gram will be charged, and 20% of the original gold will be purchased. In addition to deducting losses, Lao Fengxiang Jewelry also charges manual fees. If the gold ornaments are sold in our store, we will deduct 8% of the loss. If the gold ornaments are not sold in our store, the loss will be deducted by 10%, but it will be added by 10 yuan per gram.

30 yuan's manual fee is 2670 yuan per gram; According to the current gold price of 4 13 yuan/gram, which increased by 0.25 times to 5 16 yuan/gram, it is calculated that the price difference between the old and new necklaces weighing 89 grams is 9 189 yuan, that is, the gold price of 9 189 yuan needs to be paid for the replacement of new necklaces. In other words, the total cost that consumers need to pay is 9 189 yuan+2,670 yuan = 1 1859 yuan. The original price of the necklace (4 13 yuan/g× 89g = 36,757 yuan) plus the surcharge (excluding the handling fee), the total gold price of the necklace is 36,757 yuan +9 189 yuan = 45,946 yuan. According to the counter trading rules, on this basis, consumers can exchange their old necklaces for a gold jewelry worth 45,946 yuan. According to the gold price of 4 13 yuan/gram on that day, the weight of new gold ornaments that can be purchased for 45,946 yuan is 1 1 gram, which is more than the old gold ornaments11gram. If it is not the same brand, it usually needs to be discounted or increased, and some can't even be changed (such as Chow Tai Fook). Usually, there will be a discount of 95% to 98%, or if there is no discount to increase the cost of production, you need to add 15 yuan and 30 yuan to the original cost of production!