When ruko, a device used to stream movies at home, increases prices by 48% total revenue decreases by 61%?

Demand is elastic

Explanation:

Total revenue from the sale of a good is negatively related to the price when demand for the good is elastic and positively related to the price when demand for the good is inelastic.

So, as increase in price by 48% decreases total revenue by 61%, therefore the demand for Ruko, a device used to stream movies at home is elastic.

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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.'