Then 20 yuan's coupon is used to subtract the amount actually paid by 20 yuan from the total price: 297 yuan -20 yuan = 277 yuan.
According to the proportion of three people buying goods, 277 yuan can be distributed according to the following proportion:
-A: 120 yuan /297 yuan ≈ 40.4%.
-B: 97 yuan /297 yuan ≈ 32.7%.
-C: 80 yuan /297 yuan ≈ 26.9%.
Therefore, Party A shall pay 40.4% of the actual amount, that is, 277 yuan × 40.4% ≈1/2 yuan.
B shall pay 32.7% of the actual amount, that is, 277 yuan × 32.7% ≈ 90 yuan.
C shall pay 26.9% of the actual amount, that is, 277 yuan × 26.9% ≈ 75 yuan.
Finally, you can calculate the amount they get from the discount by subtracting the original price of the goods they buy from the amount that everyone actually pays:
-A: 1 12 yuan-120 yuan = -8 yuan (indicating that A needs to pay 4 yuan to B and C respectively).
-B: 90 yuan -97 yuan = -7 yuan (indicating that B needs to pay 7 yuan to A).
-C: 75 yuan -80 yuan = -5 yuan (indicating that C needs to pay 5 yuan to A).
Therefore, according to the preferential ratio, B needs to pay 7 yuan to A, and C needs to pay 5 yuan to A. ..