can somebody help me thanks

K means compound k times a year.

1.6 Today you have P to invest in a security that pays an interest rate of r per year and compounds in k periods. - Find the formula to determine how long it will take this investment to grow to xP ? - Does the length of time depend on the initial amount P ? - How long will it take to double the investment of $1000 where r is 6% with daily compounding? - How long will it using the simple interest rate when r is 6%