You can buy an item for $140 on an in-store payment plan with the promise to pay $140 in 90 days. Suppose you can buy an identical item for $128 cash. If you buy the item for $140, you are in effect paying $12 for the use of $128 for three months. What is the effective annual rate of interest

the effective annual rate of interest is 37.50%

Explanation:

The computation of the effective annual rate of interest is as follows:

Interest = Principal × rate × time period

$12 = $128 × rate × 3 months ÷ 12 months  

$48 = $128 × rate

rate = 37.50%

Hence, the effective annual rate of interest is 37.50%

We simply applied the above formula so that the correct annual rate could come

answer; i believe the correct answer is radioactive decay);

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.'