In 2009, an 1893 Morgan silver dollar sold for $6,450. Required: What was the rate of return on this investment? (Do not include the percent sign (%). Enter rounded answer as directed, but do not use the rounded numbers in intermediate calculations. Round your answer to 2 decimal places (e. g., 32.16).)

 7.86%

Explanation:

Using the Future Value formula;

= Amount * ( 1 + r)^n

The question is looking for the rate so making that the subject would be;

Assuming the car was $1 in 1893,

And n = 2009 - 1893 = 116 years

FV = Amount * ( 1 + r)^n

( 1 + r)^n = FV/  Amount

1 ^n + r^n = FV / Amount

r = n√((FV/ Amount) / 1^n)

r =  n√(FV/ Amount)

r =  116√(6,450/ 1)

= 1.07855

Subtract 1 for the percentage;

= 1.07855 - 1

= 7.86%

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'

the correct option is c