If you don't have a calculator that raises numbers to any power, you can work this out using logs and basic calculator functions. First, use your calculator to calculate 1+0.15/365=1.000411 approx. find the log of this=1.7844*10^-4, multiply by 365=0.06513, then find the antilog (10^0.06513)=1.1618 and subtract 1=0.1618.