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89->94 MODELING For Exercises 89-94 find the time or rate required for each in g

ID: 3116420 • Letter: 8

Question

89->94

MODELING For Exercises 89-94 find the time or rate required for each in given in the table to grow to the specified amount. The lener W represents an unknown principal Ending Principal Balance Rate Compounded Time 89. $800 90. | $10,000 | $1,000,000| 7.75% | Annually 91. SW 92. SW 93. $500 94. $1000 S2500 95. Ben's Gift to Boston Ben Franklin's gift of S4000 to Bostorn $2000 8% | Daily S3W S2W $2000 10% | Quarterly 12% ! Monthly ?Annually 25 yr ? Monthly yt grew to $4.5 million in 200 years. At what interest rate com- pounded annually would this growth occur?

Explanation / Answer

89) P = 800

ending balance = $ 2000

rate = 8%

compunded daily

A = P ( 1 + r/n )^t

2000 = 800 ( 1 + .08/365)^365t

t = 11.455 years

90)  

A = P ( 1 + r )^t

1000000 = 10000( 1+ 0.0775)^t

t = 61.70 years

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