With the rapid development of computer technology, the price of computer is constantly decreasing. After a brand of computer is reduced by M yuan according to the original price, the price is reduced by 20%. Now the price is n yuan, so the original price of the computer is () A. (45N + m) yuan B. (54n + m) yuan C. (5m + n) yuan D. (5N + m) yuan

With the rapid development of computer technology, the price of computer is constantly decreasing. After a brand of computer is reduced by M yuan according to the original price, the price is reduced by 20%. Now the price is n yuan, so the original price of the computer is () A. (45N + m) yuan B. (54n + m) yuan C. (5m + n) yuan D. (5N + m) yuan

Suppose that the original price of the computer is x yuan, then (x-m) (1-20%) = n, x = 54n + M

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