Bayi Gymnasium designed a sign made of the same cube (pictured).
The side length of each cube is 1 m, and its exposed surface (excluding the bottom surface) is made of five plywood nails and then painted. Each five-plywood can be painted on both sides, with 500 grams of paint per square meter.
(1) After increasing the cost price by 40%, the building materials store marked a five-plywood and sold it at a 20% discount. As a result, for every 4.8 yuan Reng Zhang earns (all five splints must be bought), how much does it cost to buy five splints?
(2) Paint shops offer "20 for each full 100" and buy 34 yuan per kilogram of paint. How much does it cost to buy paint? Supplement to the question:
Total exposure area? 75 square meters
* * * Need five splints? 75÷2? =? 37.5 sheets
( 1)? The original price of five splints? =? 4.8÷[( 1+40%)*0.8- 1]? =? 40 yuan/Zhang
? What is the current price of five splints? =40+4.8=44.8 Yuan/piece
? The total price of buying five splints? =? 37.5×44.8? =? 1680 yuan
(2)? The total amount of paint used? =? 75×0.5? =? 37.5 kg
? The total price before the paint purchase discount? =? 37.5×34? =? 1275 yuan
? Discount? =? 12×20? =240 yuan
? How much does it cost to buy paint? 1275-240? =? 1035 yuan? Send RMB 20 1275 per 100, of which 12 pieces 100 (the rest will not be sent).