The construction of the library cost 20000 yuan, which is 3000 yuan less than the planned investment. How much is the actual investment saved? (two decimal places before the percent sign)

The construction of the library cost 20000 yuan, which is 3000 yuan less than the planned investment. How much is the actual investment saved? (two decimal places before the percent sign)

3 (2 + 0.3) = 0.3 △ 2.3 ≈ 13.04%; a: the actual investment has been saved by 13.04%

For a commodity, first reduce the price by 20%, then reduce the price by 20%, what percentage of the current price? What percentage of the original price is the current price?
In a simpler way

If the original price a is set, the current price is: a (1-20%) (1-20%) = 64% a
1-64% = 36%
The current price is 64% of the original price

A 20% discount on a commodity means that the current price is the original price______ %It's cheaper than the original price______ %．

(1) 20% discount = 82%, the current price of a commodity is 82% of the original price; (2) 1-82% = 18%; so the answer is: 82, 18

The original price of a commodity was 100 yuan, and now it's 70% cheaper than before. What's the price?

30 yuan
100 * 70% cheaper = 70 yuan