After making a deposit, puja had $264 in her savings account. she noticed that if she added $26 to the amount originally in the account and doubled the sum, she would get the new amount. how much did she originally have in the account? (add equation)

Iam so stuck. what is the worked out answer for this question?

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

15/16 as a decimal rounded to the nearest hundredth