Beulah and Biff invest in Bertha Fund. They make an initial deposit of

$$1,000.$ After $1$ year they deposit $$3,000$ and after the third year they deposit

$$2000.$ At the end of six years they have $$10,000.$ Use Newton$$s Method to find

their effective rate of return. Your final answer should be correct to $4$ places after

the decimal place.