Without that value, we can't solve your problem, unless you are looking for an algebraic equation.
Answer:
x = 4
Step-by-step explanation:
8x = 32
/8
x = 4
Let's move like a crab, backwards some.
after 2 years?

after 3 years?

is that enough to pay the $1100?
now, let's write 1000(1+r)² in standard form
1000( 1² + 2r + r²)
1000(1 + 2r + r²)
1000 + 2000r + 1000r²
1000r² + 2000r + 1000 <---- standard form.
2x+4y=8
-2x -2x
4y=-2x+8
/4 /4 /4
y=-1/2x+2