Hich statements about doubling an investment are true? Check all that apply. An investment of $5,000 will double in 6 years at an annual compound interest rate of 12%. An investment of $1,000 will double at an annual compound interest rate of 18% in 6 years. An investment of $350 will double in 9 years at a compound interest rate of 8%. An investment of $2,000 will double at a simple interest rate of 5% in 20 years. An investment of $700 will double in 12 years at a simple interest rate of 6%.