An investor purchases one municipal bond and one corporate bond that pay rates of return of 5% and 6.4%, respectively. If the investor is in the 15% tax bracket, his after-tax rates of return on the municipal and corporate bonds would be, respectively, .

on municipal bond after tax rate of return = 5 percent

on corporate bond after tax rate of return =  5.44 percent

Explanation:

given data

rates of return = 5% = 0.05

rates of return = 6.4%  = 0.064

tax bracket = 15% = 0.15

solution

first we get on municipal bond yield

municipal bond is tax exempt so

as on municipal bond there is no taxes is levied

so that here after tax rate of return will be as 5 percent

and

now we get after tax yield on corporate bond that is

after tax rate of return = rates of return × ( 1 - tax bracket  )  1

after tax rate of return = 6.4% × ( 1 - 15%)

after tax rate of return = 0.064 × ( 1 - 0.15 )

after tax rate of return =  5.44 percent

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.'

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