1)Mass production of cows has continued to effect the environment for decades, giving the methane emissions produced by cows

1)Please use this google drive link to download the answer file.       

https://drive.google.com/file/d/1MFrWLWd19RWQdX-L0FdJCAShqaoEtbU7/view?usp=sharing

Note: If you have any trouble in viewing/downloading the answer from the given link, please use this below guide to understand the whole process. 

https://helpinhomework.org/blog/how-to-obtain-answer-through-google-drive-link 

2)Interest amount paid on 20th payment = 80000*(9%/12)

Interest amount paid on 20th payment = $600

==

For Wanda Harper,

Interest amount paid on 20th payment = 80000*(9%/12)

Interest amount paid on 20th payment = $600

==

For Tony Zang,

Interest amount paid on 20th payment = 80000*(9%/12)

Interest amount paid on 20th payment = $600

So, the interest amount paid on 20th payment, remains same for all the three individuals as loan balance and monthly rate remains same.

But the value of each monthly payment changes. It becomes smaller with increase in duration of the payment period when loan amount and rate remains same.