To find the change in height, we need to subtract the final height from the initial height.
- Initial height:
meter - Final height:
meter
Now, we can calculate the change in height:
To subtract these fractions, we need a common denominator. The least common multiple of 20 and 50 is 100. We can convert both fractions:
Now we can perform the subtraction:
Thus, the change in height is
So the correct answer is