Answer:

Step-by-step explanation:
-This is an addition/subtraction problem.
#We subtract the sum of the first two expression from the third expression:

Hence, the expression
must be added to the first two.
if you want to be sure :/
1 + 1x
OR
1 + x
They mean the same thing! Hope this helps!
So using the conversion of 1 metric ton to kg, we see that there are 1000 kg in 1 ton. Then we can divide 40 by 1000 to find the decimal:

Then to convert this decimal to a percentage, we must multiply by 100%:

So now we know that 40 kg is 4% of 1 ton.