Tom tunes pianos in his spare time for extra income. buyers of his service are willing to pay $155 per tuning. one particular week, tom is willing to tune the first piano for $120, the second piano for $125, the third piano for $140, and the fourth piano for $160. assume tom is rational in deciding how many pianos to tune. his producer surplus is
a. $95.
b. $80.
c. $75.
d. $60.

B - $80

Explanation: Producer surplus is the difference btw what a consumer is paying and what a producer is charging.

From the above questions, Tom tuned the following pianos:

Buyer willing to pay $155.

Tom tuned piano 1 for $120, therefore his surplus on piano 1 is $155 - $120 = $35

Tom tuned piano 2 for $125, therefore his surplus on piano 2 is $155 - $125 = $30

Tom tuned piano 3 for $140, therefore his surplus on piano 3 is $155 - $140 = $15

Tom tuned piano 4 for $160, therefore his surplus on piano 4 is $155 - $160 = ($5)

All together his surplus is $35+$30+$15 =$80

B) $80

Explanation:

The price for every piano tuning = $155, and Tom's costs for tuning pianos area as following:

Since Tom is rational, he will only tune 3 pianos per week, since the tuning of the fourth piano is more expensive than the price charged.

Therefore, Tom's total suppliers surplus = $35 + $30 + $15 = $80

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.'

answer; ///after donning a gown, mask and eyewear;