According to the rule of 72, t=72/r which statement is true?
a. An investment of $3,100 will double in 12 years at a compound interest rate of 5%.
b. An investment of $9,000 will double in 10 years at a compound interest rate of 7%.
c. An investment of $4,500 will double in 8 years at a compound interest rate of 9%.
d. An investment of $3,000 will double in 4 years at a compound interest rate of 12%.
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