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A store marked a certain type of air conditioner at a 20% increase in cost, and then sold it at a 15% discount. The current price is 5100 yuan A store price a certain type of air conditioner at 20% of the cost increase, and then 20% off the price. Now the price is 5100 yuan (1) How much is the cost of this type of air conditioner? (2) The store also launched a new sales plan, which can be divided into two payments. Customers pay a sum of money in advance when they buy, and the remaining part and its interest (annual interest rate is 4%) will be paid in one year. If the two payments are the same, how much yuan is payable each time?
① Cost: 5100 / 0.85 / (1 + 20%) = 5000
② Suppose that the amount payable each time is X: then x = (5100-x) + (5100-x) × 4%
It is concluded that x is 2600 yuan
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