Solution:
Given Information,
Heat input is (
) = 5.5 ×
Btu/h
Combustion efficiency of the boiler (
) = 0.7
Combustion efficiency after turn up (
) = 0.8
Operation Hour (t) = 5200h
Unit cost (c) = 
Calculate heat output from the boiler
=
x 
= 5.5 x
x 0.7
= 3.85 x
Btu/h
Calculate the heat input to the boiler after the tune-up
=
/ 
= 3.85 x
/ 0.8
= 4.8125 x
Btu/h
Calculate the saved energy after the tune-up
=
- 
= 5.5 x
- 4.8125 x
Btu/h
= 0.6875 x
Btu/h
Calculate the annual energy saving (
)
=
x t
= ( 0.6875 x
Btu/h ) ( 5200 hr/yr)
= 3575 x
Btu/h
Calculate the annual cost saving
Annual cost saving =
x Unit cost
= 3575 x
Btu/h x 
= 82225
Answer: a. $4,000
b. $5,000
Explanation:
a. If she can sing at each wedding but decides to maximise profits, she will only sing at the weddings of those paying her $200 as it is the higher of the two payment options.
Should she sing at the $200 customer weddings, she would make;
= 20 people * $200
= $4,000
b. Price Discrimination is the charging of different types of customers different prices for the same or similar goods.
If your friend knows how to perfectly charge the two different groups the different prices that they value her at then she will be able to attend and sing at both weddings making her revenue;
= (10* $100) + (20 * $200)
= 1,000 + 4,000
= $5,000
<span>Opening up to international trade would lead a country to increasing its production and specialization of goods. For example, if a country opens international trade and some factories are making a household appliance, the instructions would need to be in the trade countries languages as well as the native language. The number of household appliances made would need to be increased to meet the growing need.</span>