To solve the problem we will convert currencies and then solve the Problems.
Given to us
TPA, 1 USD = 1 TPA
CSW, 1 USD = 20 CSW
NRD, 1 USD = 5 NRD
Why use currency exchange?
1.) A traveler needs to visit a currency exchange to exchange his currency to the local currency of the country in which he is staying.
2.) We know that 1 USD = 20 CSW,
therefore, 100 USD = 20 x 100 = 2000 CSW.
Thus, your $100 will be equal to 2000 CSW dollars.
3.) We know that 1 TPA = 1 USD,
therefore, 100 USD = 100 x 1 = 100 TPA
Thus, your $100 will be equal to 100 TPA.
What is the cost of the computer part?
4.) We know that 1 USD = 1 TPA, while 1 USD = 20 CSW,
Given the cost of the computer part,
it will be 200 TPA = 200 USD,
it will be 1000 CSW = 50 USD,
Thus, the computer part will be cheaper, by 150 USD.
5.) As it is given that 1 USD = 3 NRD,
while now that 1 USD cost 5 NRD, therefore, now the same product will be cheaper.
For, example a product costing 300 NRD would be 100 USD last year but would cost only 60 USD now.