I think its... A (but not sure)
For this case we have the following system of equations:

We can write a system of equivalent equations.
For this, it is enough to multiply one of the two equations by a scalar.
Multiplying the equation 1 by 2, we have:

Therefore, the new system of equations is:

Answer:
A system that is equivalent is:
D) 
Usually it’s around the percentage of about forty five percent
Step-by-step explanation:
1 ton = 2,000 Pounds
110 x 5 = 550
You multiply by 5 because 2,000 x 5 = 10,000.
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Hope that helped.