You buy a government bond for $128 and sell it for $155 one year later. What was your rate of return (interest rate) measured in percentage terms? Round to two decimal places. Do not enter a % sign.

21.09

Explanation:

The rate of return or the rate of interest is computed as:

Rate of return = Selling price of bond - Purchase price of bond / Purchase price of bond × 100

where

Selling price of bond is $155

Purchase price of bond is $128

So, putting the values above as:

Rate of return = $155 - $128 / $128  × 100

Rate of return = $27 / $128  × 100

Rate of return = 0.2109  × 100

Rate of return = 21.09

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.'

in terms of experimental research, mcdonald’s charging different prices in the two cities relates to