An investment offers to quadruple your money in 18 months (don't believe it). required: what rate per three months are you being offered? (round your answer as directed, but do not use rounded numbers in intermediate calculations. enter your answer as a percent rounded to 2 decimal places (e. g., 32.16).)

Let us assume that amount invested = 100

It quadruples meaning, it becomes = 100*4 = 400

We use the future value formula here

FV = PV * (1+r) ^n

here FV = 400

PV = 100

n = 18 months or 18/3 = 6 quarters (Since we need a three month rate)

400 = 100 * (1+r) ^6

4 = 1 * (1+r) ^6

r = 4^ (1/6) - 1

r = 1.2599 - 1 = 0.2599

Interest rate being offered = 25.99% (Rounded to 2 decimals)