So one is priced ink 3000 contract. And a pen with the 4000 contract price. Two days Contact bought 3 + 5 = 8 ink. Thus, the total amount Contact bought ink is: 3000 x 8 = 24 000 (VND) Two days Contact bought 4 + 4 = 8 pen. Thus, the total amount bought pens Union are: 4000 x 8 = 32 000 (VND)
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