THIS IS URGENT! WILL GIVE BRAINLIEST TO PERSON WHO ANSWERS I invested all of my money in an investment that pays the same annually compounded interest rate for 30 years. At the end of the first 10 years, my investment had doubled in value.
a. After how many years will my original investment have multiplied by 4 in value?
b. If I initially invest 5,000 dollars, how much will my investment be worth at the end of 30 years?

(a) The Rule of 72 is also used to determine how long it takes for money to halve in value for a given rate of inflation. For example, if the rate of inflation is 4%, a command "years = 72/inflation" where the variable inflation is defined as "inflation = 4" gives

18 years.

(b) If you're holding $5,000 in savings, for instance, and the national average is 0.10 percent APY, you would return just $5 over the course of a year. If you instead put that same $5,000 in an account earning 2 percent, you'd earn $100.

Step-by-step explanation:

hope it will help you have a great day bye and Mark brainlist if the answer is correct

i think the amount would be $140.62