9. The time t (in years) for an investment to increase by i=0.10 (=10%) when the interest rate is r=0.06 (= 6%) is given

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9. The time t (in years) for an investment to increase by i=0.10(=10%) when the interest rate is r=0.06 (= 6%) is given byln(1+i)/r. For a numerical example given here it will be t=ln1.1/0.06 Evaluate this expression by using the first four termsof the appropriate series for following values of i and r. You mayuse ready formulas from text for ln (1+x) series
i=0.25, r=0.12