At a rate of $6\mathrm{.}25\%,$ what is the present value of the following cash flow stream: $$0$ at Time $0$; $$75$ at the end of Year $1$; $$125$ at the end of Year $2$; $$100$ at the end of Year $3$ ; and $$225$ at the end of Year $4?$

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What is the present value of a perpetuity that pays $$225$ per year if the appropriate interest rate is $5\%.$

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What is the rate of return you would earn if you paid $$1,100$ for a perpetuity that pays $$85$ per yea

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Please show how to calculate these using a texas ba ii plus calculator.