A new sports car sells for $40,000. The value of the car decreases by 12% annually. After how many years will it be worth half of its selling price

n= 6.11 years

Explanation:

Giving the following information:

Present value= $40,000

Future value= $20,000

Decrease rate= 0.12

To calculate the number of years for the car to reach a value of $20,000; we need to use the following formula:

n= ln(FV/PV) / ln(1+i)

n= ln(20,000/40,000) / ln(1.12)

n= 6.11 years

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.'