Tangency is when a line is fully outside the circle and touches it in one place.
The point of tangency would be point H
If it is 50% then it should be half of the original price.
For Example: $30.00 - 50%... the answer would be $15.00 since its the half of the $30.00
It would be 0.2222 so it's your answer
What do u mean a reasonable value of the range range is used when there are 2 numbers not in a sentence