Which of the following statements is/are TRUE?

$$\begin{gathered} 1. 64 + 0.64 + 0.0064 = 8.88 \\ 2. 81 + 0.81 + 0.0081 = 9.09 \end{gathered}$$

The marked price of a shirt is twice of the cost price. To earn a gain of 25%, what should be the discount percentage?

A man sells two articles. The cost price of the first article is equal to the selling price of the second article. The first article is sold at a profit of 20% and the second articles is sold at a loss of 20%. What is the ratio of the selling price of the first article and the cost price of the second article?

The difference between the compound interest (compounding annually) and simple interest on a sum at the rate of 12% per annum for 2 years is Rs 360. What is the sum (in Rs)?

There are two numbers such that the first number is half of the second number. If their average is 57, then what is the first number?

X and Y started a business investing Rs 12000 and Rs 9000 respectively. After 4 months, X left the business and Z joined the business by investing Rs. 18000. At the end of the year, there was a profit of Rs 12500. What is the share (in Rs) of Z in the profit?

If A : B = 2 : 3 and B : C = 4 : 5, then what is (A + C) : B?

If 30% of 40% of X is 240, then what is the value of X?