Reena made a fixed deposit for certain years. She deposited 3 12,000 and after maturity of the fixed deposit she got 15,972. The interest rate was 10% p. a. compounded annually. Find the time.

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Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.