1.Sid saves $8,000 into a savings account earning 4.5% interest. How long will it take to double Sids savings?

2.Donnesh puts $5,000 into a savings account with a 10% interest rate. How long will it take to double the initial amount?

3.Niko wants to double his initial savings amount of $7,500 within the next 15 years. Using the Rule of 72, what annual interest rate does Niko need to narrow his search down to when looking for different savings accounts?