Doubling 30,000 is 60,000. If you multiply it by 1 times, it will be doubled. Doubling 2 times will become 3 times of the original; And 1 times is equal to the original; 2 times more than the original 1 times.

Double the income means double the principal, that is, the income 100%, even more than 100%. Suppose an investor buys a fund with 1 1,000 yuan, and the return on investment of the fund is 1 1,000% after one year, then the income obtained by this investor becomes 20,000 yuan, which is called doubling.

double；twofold

Double is better than the original 2. Quadrupling is to multiply the original by 2 (that is, the square of 2). Turn n times is to multiply the original base by the n power of 2.

Some junior high school math knowledge that is easy to make mistakes has doubled or quadrupled. In fact, quadrupling is easy to understand, but quadrupling is easy to make mistakes. Similar words are often used in playing mahjong and fighting landlords. For example, fighting landlords 10 yuan, a bomb doubled, that is, 20 yuan. If there is another bomb, will you win twice as much money? You beat 40 yuan. This is four times.