I have a math question about loans!

Question

anonymous · Answer

http://gyazo.com/8c3a0ee0381374b4b5f8562115620db2 ^^ QUESTION IN LINK :)

theyankee · Answer

I think the entire interest paid would be 27, 200.

anonymous · Answer

the correct answer was 73,000

anonymous · Answer

:c

theyankee · Answer

Omg!!! I'm so sorry....Guess I'm a little rusty with accounting :( :( :(

anonymous · Answer

its okay i have a diffrent type of question maybe you can help?

theyankee · Answer

Let's see it :)

anonymous · Answer

http://gyazo.com/217e533462b7ae3b46396007833e4ecb

anonymous · Answer

i posted the link above

theyankee · Answer

Just a sec.

nnesha · Answer

$$\huge\rm A = P (1+\frac{r}{n})^{nt}$$
use this equation 
where 
t= time 
r= rate (first change percent to decimal )
p= initial amount 
n= number of time/year

nnesha · Answer

for 2nd one key work is "decreases"
so it would be (1-r/n)

anonymous · Answer

so the same equation just minus it ?

theyankee · Answer

I consulted other folks and they told me this. Area = 4000 km^2 * (1−0.0725)^11 = 1747.89 km^2

nnesha · Answer

$\color{blue}{\text{Originally Posted by}}$ @laurenbaybiee
so the same equation just minus it ?
$\color{blue}{\text{End of Quote}}$
yes minus instead of positive