If the price of a computer is RMB m after 20% reduction, the original price of the computer is RMB a.0.8m, RMB b.0.2m, RMB c.0.2, RMB m, and RMB d.0.8

If the price of a computer is RMB m after 20% reduction, the original price of the computer is RMB a.0.8m, RMB b.0.2m, RMB c.0.2, RMB m, and RMB d.0.8

D. RMB 0.8 per cent

With the development of electronic technology, the price of mobile phone is constantly decreasing. After the original price of a brand mobile phone is reduced by M yuan, it is reduced by 20%. At this time, when the price is n yuan, the original price of the mobile phone is______ Yuan

∵ the price after the first price reduction is x-m, ∵ the price after the second price reduction is (x-m) (1-20%), ∵ according to the price after the second price reduction is n yuan, the countable equation is (x-m) (1-20%) = n, ∵ x = 54n + M. so the answer is: 54n + M

The original price of a computer was 7200 yuan, but now the price is reduced by one eighth. How much is the price of each computer now?

7200 x (1-1 / 8) = 6300 yuan