A deposit of $1000 earns a continuous force of interest given by 0.06t for the first three years (t is time in years), and a constant force of 0.04…

A deposit of $1000 earns a continuous force of interest given by 0.06t for the first three years (t is time in years), and a constant force of 0.04 thereafter. What nominal quarterly compounding rate is earned over the first 4 years?

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