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The answer here is C. The sign of the factors are both positive. We can use the FOIL method as reference in determining the sign of the factors. The 3rd term C is positive; therefore our only option is either both negative or both positive. Looking the middle term, which is positive, we know that the middle term is the sum of the outer and inner in FOIL method, which means, signs of the factors must be both positive
A= P(1 + r/n) ^nt
21000=7000(1+0.055/2)^1t
t = 20.52 years
Evaluate 1.80/Y for y= 0.009
We replace 0.009 for y
So fraction becomes 
Now , to simplify the fraction we try to remove the decimal from denominator
0.009 have three digits after the decimal point, so we multiply by 1000 to remove the decimal point. Multiply top and bottom by 1000 to make equivalent fraction.

= 200
Answer is 200