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What mathematical knowledge did you find in the process of buying new year's goods?
Calculate the total amount according to the unit price.

China New Year is coming. Today, my mother and I went to the supermarket to buy new year's goods. We bought 65,438+07 pieces, including wonton 65,438+02.9 yuan, glutinous rice balls 65,438+065,438+0.9 yuan, three cheese sticks at 20.8 yuan each, and three glutinous rice balls at 65,438+065,438+each. Sweet water surface 1 1.9 yuan bought two bags, including dough 9.9 yuan, yogurt 19.8 yuan, duck heart 17.28 yuan, duck 17.9 yuan, bread 8.8 yuan and Pleurotus eryngii 7.9 yuan.

When I paid the bill, my mother asked me to calculate how much I spent on shopping today. I took the receipt and began to calculate:

12.9+ 1 1.9+20.8× 3+ 1 1.9× 2+ 19.8+ 17.28+ 17.9+8.8.

In addition, the supermarket activities saved 1 1.6 yuan that day, and the promotion price saved 45.3 yuan, so the total amount of money spent today is182.68-(1.6+45.3) =125.