How to use the M + m-mrc in the lower left corner of the calculator?

MRC - click (MR) to read the value of M, and then click to clear the stored number (MC) (the stored number changes to 0, and M disappears). - M + - add the number in the display column to the stored number. - M - M - subtract the number in the display column from the stored number

The price of a commodity after 25% price reduction is m yuan, and the price before price reduction is m yuan
Such as the title, urgent

m÷（1-25%）
=m÷3/4
=3/4m

If the price of a commodity after 25% reduction is m yuan, the price of the commodity will be reduced

M ÷ (1-25%) = original price. Original price - M = the answer you want

If the price of a commodity after 25% reduction is x yuan, then the price before the reduction is x yuan___ Yuan

According to the meaning of the title: the commodity price before the price reduction is: X (1-25%), that is 43x yuan

If the price of a commodity after 25% reduction is 120 yuan, the price before the reduction is 120 yuan______ Yuan

Suppose the price before the price reduction is x yuan. From the meaning of the question: X (1-25%) = 120, the solution is x = 160

For a commodity, first increase the price by 25%, and then reduce the price by 25%. Now the price is compared with the original ()
A. Proposed B. reduced C. unchanged D. not sure

Suppose that the original price of a commodity is 1 and the present price is 1 × (1 + 25%) × (1-25%) = 1 × 125% × 75% = 0.93750.9375 ＜ 1, then the present price is lower than the original price

A new year's sales promotion was held in a shopping mall. The price of a computer was 6480 yuan after a 10% reduction in price, so the original price was

Original price = 6480 (1-1 / 10) = 7200 yuan

A shop is engaged in promotion activities. A mobile phone now costs 600 yuan per unit, making a profit of 20%. If the original price can make a profit of 30%, how much will the price of the mobile phone be reduced in this promotion?

600 △ 1 + 20%, = 600 △ 120%, = 500 (yuan); 500 × (1 + 30%), = 500 × 130%, = 650 (yuan); 650-600 = 50 (yuan); a: the price of the mobile phone is reduced by 50 yuan in this promotion

During the National Day in a shopping mall, a product of 800 yuan was sold for the first time
During the national day of a shopping mall, a product of 800 yuan sold slowly after the first price reduction, so the second price reduction was carried out. The percentage of the second price reduction was twice that of the first one. As a result, the product sold out quickly at the price of 476 yuan. What's the percentage of each price reduction?

Let the percentage of the first reduction be X
Tip: suppose the percentage of the first price reduction is X,
Then 800 (1-x) (1-2x) of the second reduction is 576
(1-x)(1-2x) =1-3x+2x²
=2(x²-3x/2+9/16)-9/8+1
=2(x-3/4)²-1/8=18/25
(x-3/4)²=169/400
x-3/4=±13/20
The solution is X1 = 1.4 (rounding off) x2 = 0.1
The percentage of the first reduction is 10%

The original price of a brand computer in Kyushu shopping mall was 3000 yuan. Now the shopping mall is engaged in promotional activities. The price of the brand computer is reduced by 5% at first, and then increased by 5%
How much does it cost to buy a computer of this brand?

3000×（1-5%）×（1+5%）
=2992.5

How to use the M + m-mrc in the lower left corner of the calculator?