$R(0,t)$ is the Spot Zero$-$Coupon $($or Discount$)$ Rate. It is the annualized rate on a pure Unit Discount bond $B(0,t)-$ the bond that pays $1$ dollar at time $t.$ Assume that $R(0,7)=7\mathrm{.}70$ per cent. What is the price of $B(0,7)?$ Answer with three decimal digits accuracy. Example: $0\mathrm{.}728$

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